Izanami-no-Mikoto (伊弉冉尊, 伊邪那美命) or simply Izanami, is the primordial Shinto mother goddess and sister/wife to Izanagi-no-Mikoto. She helped stir the oceans on the Bridge of the Heavens, and settled down with Izanagi on Earth on their island Onogoro. On their first marriage ceremony, she made the mistake of speaking to Izanagi first, so the ritual had to be repeated. After the second ceremony she gave birth to various deities.
But then she gave birth to Hi-no-Kagutsuchi the Deity of Fire, and died from the severe burns of the flames. When she perished, she went to Yomi, the Land of the Dead. Izanami ate from the furnace of Hell, and went to petition the deities of the Netherworld to let her go. She made her husband promise not to look at her, but Izanagi did anyway and was greeted by the sight of a rotting corpse with the Eight Thunders protruding from her body. Ashamed by Izanagi's indiscretion, she sent the Yomotsu-Shikomes, the Thunders and Yomotsu-Ikusas after him. Izanagi sealed the entrance to Yomi with a boulder, and Izanami cried, "Why did you do such a thing to me?! You betrayed me!! Remove this boulder this instant or I'll kill 1000 of your subjects everyday!" Izanagi countered, "For every 1000 you kill, 1500 shall be born in their place!" and thus their marriage was over. She became the Yomotsugami, the Goddess of the Land of the Dead.
Yumiko Shirasagi is in fact the reincarnation of Izanami. After witnessing Akemi Nakajima's secret activities using computer programmings to summon out Loki, Yumiko was set to be sacrificed to Loki, despite Nakajima's plead for her to stay away. When she arrives at school the following day, she is captured by the brainwashed students of the school and is overpowered when Loki summons himself into the material world. During the resulting battle, she hears Izanami's voice and is temporarily possessed by Izanami, who wounds Loki and opens a portal to Asuka for her, Nakajima and Cerberus to escape through. Izanami instructs the dying Yumiko to have Nakajima to take her corpse to Izanami's grave so that she can be revived.
When Nakajima arrives and places Yumiko on the grave, Izanami appears before him, telling him to clash together the two orbs given to him by Yomotsu-Shikome when the time is right. Shortly after, Loki appears, having followed Nakajima with the aid of Ohara. Izanami attempts to fight off Loki, but is overpowered. She is saved when Nakajima summons Hinokagutsuchi from the orbs and slays Loki. Izanami then returns Nakajima to his home, warning him about Ohara's summoning of Seth, but keeps Yumiko with her so that she can teach her how to use her powers.
Keeping with the ending of the first novel, Izanami sends Nakajima back to his home, but keeps Yumiko with her to teach her how to use her powers. After Isma Feed, Ohara and Seth begin moving along with their plans, Izanami allows Yumiko to return to the physical world to aid Nakajima after Yumiko hears her mother's voice as Ohara kills her and the rest of her family. Much later in the story, Nakajima visits Izanami in her tomb, hoping to receive something that would allow him to fight Seth, who at this point has possessed the unborn child of Ohara and Loki and attached himself to Yumiko. Izanami gives Nakajima her robe, explaining that it was actually Izanagi's robe, and will bring out Nakajima's latent power as well as allow him to fly and face Seth. After giving him the robe, Izanami fades into the afterlife, as the robe was the only thing keeping her in the realm of the living.
Lucifer goes to Izanami’s location, Yomi, in order to control the goddess who had bestowed divine protection upon Nakajima and Yumiko, making her unable to communicate with Yumiko. As chaos gradually descends into Earth much to Nakajima's despair, Izanami’s voice finally reaches Yumiko and she explains that Lucifer has been sealing her power until now, but now that Yumiko has received it, she will be healed in a instant. Nakajima, though, is driven mad by Lucifer's minions and brandishes Hi-no-Kagutsuchi towards her. In that moment, Izanami takes hold of Yumiko’s body and uses her power to kill Nakajima.
Nakajima dies in Yumiko's arms and she falls into despair. Yumiko throws all her anger at Izanami whose thoughts cannot reach her anymore and takes Hi-no-Kagutsuchi out of Nakajima’s hand and stabs her own throat. The next day, Izanami, now in Yumiko’s body, carries Nakajima’s corpse in her arms and, in order to bury him, walks west towards Asuka.
Izanami is captured by Lucifer to be used to summon his temple to Shirasagi Mound, and is imprisoned in a casket within the Rotting Sea of Flames. Using the Orb of Silence, obtained after slaying the Minotaur, the Orb of Malice, gained after defeating Loki, and the Orb of Resolve, won after killing Hecate, Nakajima and Yumiko are able to free Izanami from her imprisonment by placing the Orbs in the correct slots. In gratitude, Izanami gives them her clothes, allowing them to travel through the Sea of Flames harmlessly and reach Seth.
In the Kyūyaku version of the game, if Nakajima brings her the silk thread, she will take it after noting that she won't be able to make something for them in time before fighting Lucifer, but will state that it might be useful and use it to weave something for the hero of Megami Tensei II to use if the game is continued to Megami Tensei II after defeating Lucifer.
In Belial's Castle, Izanami's spirit resides in a chamber. If the hero finds the Revivifying Incense in Moloch's Temple, he can bring her back to life, allowing Izanagi to open the way to Lucifer's Temple.
In Kyūyaku, if Nakajima gave her the silk thread before, Izanami will then reward the Megami Tensei II hero with another set of her clothes, which protects the wearer from poisonous swamps.
Izanami makes a brief appearance in the post-game Diamond Realm dungeon, which is accessible after beating the game once. She thanks Aleph for helping Hiruko in the Underworld. She remarks that seeing Aleph and Hiroko together reminds her of Izanagi and herself when they were first married.
Izanami appears along with Izanagi in the Tomb of Yomi in the 666th basement of the Labyrinth of Amala in a second playthrough if a qualifying Press Turn was achieved in all Burial Chambers. After this, the Demi-fiend must meet with Cerberus in the first Burial Chamber in the First Kalpa to reach them both.
It is mentioned she and Izanagi were the creators of the old world, and that they lost their power with the advent of the Conception. They give the Demi-Fiend a sliver of their power, represented as an extra Press Turn, and beg him to pursue the path of creation, making a new world.
Izanami is an opponent faced in the New Game PlusChallenge Quest, Yomotsu Okami's Revenge, in Blasted Tokyo, post-alignment lock. Pluto's poison has awakened her and sent her on a rampage, which leads her to reside in the same room Pluto did in Pluto Castle. She wants to kill a thousand humans a day, calling them hateful living beings. Eventually, she starts repeating "Die!", over and over, before starting the battle.
In battle, she mostly uses Purple Smoke to charm enemies, gain Press Turn with critical hits and Smirk. As the battle advances, she starts using Ancient Curse and Mamudoon. Much like other optional bosses, attempting to use reflector moves will result in Izanami spamming Megidolaon. Defeating her allows her to regain her sanity and remove the hatred from her mind. She believes some entity sought to control all the gods of the underworld in order to have them kill off all of humanity.
She tells of an evil within her that envies the living and seeks to kill them, and how the entity took advantage of it, but thanks to Flynn she was saved. Izanami realizes that humans and gods must eventually cooperate with each other to ensure that neither is wiped out. She expresses gratitude to Flynn before leaving.
The last of the National Defense Divinities, Izanami was Tamagami's last ace. The deranged ex-minister intended to summon the goddess if the need arose to wipe out Japan, should it become hopelessly corrupted by foreign influence. However, her living medium Noa was unable to bring the goddess forth while alive. Instead, she was sent into stasis, which blocked the summoning for 25 years - the computers monitoring the data flow registering an error.
With Noa's death in the Challenge QuestDefeat the Ghosts, the download completed. Izanami, tricked by the hordes of undead created by Tamagami, prepared to wipe out Tokyo to create an entirely new country, influenced by the politician's deranged views of an Ideal Tokyo. In battle, Hiroshi can attack Izanami, confusing her, blocking her from casting Vengeful Curse and removing her Smirks. As her HP drops, she begins using Smile Charge to power up her Thunder Gods attack and finishing off with Megidolaon.
After being defeated, she wearily asks why Nanashi opposes her. Hiroshi bitterly acknowledges she's worried about Japan, but that it's wrong to ignore the people to protect the country. After explaining that humans are on the road to fixing the country, Hiroshi executes the goddess, releasing Noa for good.
After being defeated, Izanami can be summoned in the Cathedral of Shadows. She can teach Nanashi the Thunder Gods and Concentrate skills, but she cannot pass on the Dark Grudge skill in any way. Izanami benefits from learning Electricity, Darkness, Ice and healing skills.
"A Mother Earth goddess of Japanese mythology, she gave birth to the islands with her consort Izanagi. She mothered many gods, but she died of burns birthing the fire god Hinokagutsuchi. Izanagi traveled to Yomi no Kuni to bring her back to the land of the living, but because she ate the food of Yomi, she was no longer able to return. When Izanagi lit a torch and saw her rotting body covered with maggots, he ran in fear. Afterwards, Izanami became the goddess of the dead, Yomotsu-Okami."
—Devil Summoner: Soul Hackers 3DS Compendium
Izanami is a demon exclusive to the 3DS remake, available at the very end of Nemechi's male growth path and costs 500 D-Souls. Her artwork comes from Shin Megami Tensei NINE.
Izanami is the highest level Megami demon in the remake, a role originally held by Anat. She is many ways a counterpart to Lucifrost, the equivalent at the end of the female Nemechi growth path.
Izanami appears as a randomly appearing boss in the Control Room of the Abandoned Factory. Defeating her causes her to drop her Material Card, Netherworld Path, allowing her to be summoned in the Velvet Room.
Like in Innocent Sin, Izanami appears as a randomly appearing boss in the bonus dungeon, the Bomb Shelter, and drops her Material Card upon defeat.
Izanami later appears in the Tatsuya Suou scenario added to the remake. She resides in the Tower of Emotion that is part of the Kadath Mandala. They question Izanagi's actions and human emotions. She wears a mask to crush her emotions, as she still feels love for Izanagi. Her anger towards him has disappeared and the curse she made long ago has ceased. Now she yearns for him like the days of old, wearing a mask as she wishes to be with him once more. She then gives them the Trapezohedron of Emotion.
Izanami plays an important role in Persona 4 by being the game's true antagonist. Fighting her is available through the true ending. Intrigued by humanity's true desire, Izanami takes the form of a human, and bestows various people their latent powers of invoking Personas. Izanami believes that by observing the ones who have awakened, she would learn and be able to carry out humanity's true desire.
Disguised as an attendant working in the Moel Gas Station of Yasoinaba, Izanami awakened the Persona using abilities of at least three humans as part of her experiment: Tohru Adachi, representing Emptiness; Taro Namatame, representing Despair; and the protagonist, representing Hope. It is unknown how many humans Izanami awakened, but she implies many have been awakened by her.
Using her identity as a gas station attendant, Izanami spread rumors regarding the urban legend of the Midnight Channel. As the Midnight Channel reflects the images of the viewers' desires, Izanami believed this would make her understand humanity's wishes. Izanami created several facets of herself, the gods of fog Ameno-sagiri and Kunino-sagiri*, to watch over the experiment.
Izanami sets her plan in motion; upon the protagonist's first meeting with Izanami, taking the identity of the Moel Gas Station Attendant, Izanami takes an interest within the protagonist's potential, and gives his latent talent of invoking a Persona a push via a handshake.
After the protagonist's first interaction with the gas attendant, Izanami visits the protagonist in his dream where Izanami taunts the protagonist's wish to reach the truth, but asks him to follow her if he truly wishes to seek the truth. As the year goes on, Izanami observes that Adachi's actions have the greatest effect on people, and so prepares to flood the world with fog and turn everyone into Shadows in response to what she assumes is humanity's wish.
In the events of the True Ending, after defeating Tohru Adachi and defying Ameno-sagiri's plans, the protagonist discovers the attendant's true identity as Izanami, and upon realizing the protagonist's determination of seeking the truth and stopping her from carrying out her plan, Izanami chastises the protagonist's persistence to seek the truth, and tells him that she shall await the protagonist's defeat in the "other world;" Izanami's reality within the Midnight Channel, Yomotsu Hirasaka.
In the party's final confrontation with Izanami, she faces the party in her goddess form, but it is revealed to be a fabricated appearance when the protagonist uses the Orb of Sight, an item given by Igor, to shine upon the truth. Having her facade taken away, Izanami reveals her true form as Izanami-no-Okami, a rotting, death-ridden being. Despite the party's efforts, Izanami-no-Okami sends the protagonist and his comrades to the underworld. As the protagonist is about to give up, he hears the voices of his Social Links, encouraging him to stand back up and finish the death-ridden goddess.
Accumulating the bonds and powers of the Social Links he had forged thus far, the protagonist channels the powers to his initial Persona, Izanagi, transmogrifying Izanagi to his true form, Izanagi-no-Okami. Bemused by the protagonist's powers, Izanami-no-Okami repeatedly attacks the protagonist, but is surprised the protagonist endures all her attacks. Asking how the will of so few could defy the will of humanity, the protagonist ultimately summons Izanagi-no-Okami, defeating Izanami with one powerful attack, known as "Myriad Truths."
Upon Izanami's defeat and freeing his comrades, Izanami exclaims she will no longer interfere with humanity and encourages them to live and face their own decisions, but cannot guarantee their happiness, and fades away. Along with her destruction, the fog in the Midnight Channel lifts and it returns to its original state, a paradise and the Shadows in it had became peaceful.
Despite Izanami's antagonistic nature, she wishes for humanity's happiness, as evident that she later congratulates the Investigation Team for discovering the truth, as well as defeating her.
Persona 4 Golden reveals that the goddess's true name is Izanami-no-Mikoto. The original goddess was separated into Marie/Kusumi-no-Okami, Izanami-no-Okami, Kunino-sagiri and Ameno-sagiri in ancient times. Izanami-no-Okami views Marie suitable only for getting rid of the fog. With the defeat of the other three parts, Marie becomes whole once again.
In Shin Megami Tensei IV, she has a weakness to fire, referencing her death after her birth of the fire god, Hi-No-Kagutsuchi.
The commentary of Kazuma Kaneko Works III explains the dark purple spots all around NINE Izanami's body symbolize the maggots which are commonly seen feeding on corpses. While the Shimenawa ropes wrapped around her body represent purification of her originally corrupted flesh.
In Persona 4, she has two forms in her boss fight. Her first form was that of a beautiful goddess, radiant and holy, reflecting her origin as the Shinto Mother Goddess. Her second was that of a rotten decaying and unholy abomination, reflecting her transformation into the Goddess of the Land of The Dead after the assumed betrayal of her husband.
Izanami cannot be killed in Persona 4 during any of her phases. Attempting to do so (such as by hacking Thousand Curses onto a persona) will result in the game crashing.