Mou-Ryo can be found in Shinjuku. Flynn must have the Demonlingual App in order to communicate with one. Mou-Ryo can teach Flynn the Mudo, Spirit Drain and Pulinpa skills through its Demon Whisper. It is also one of the demons needed in order to summon Kanbari through special fusion. Mou-Ryo can evolve into Inferno upon reaching Lv.28.
"A spirit of the dead that failed to ascend to the heavens in Japanese lore. Some have evil intent, but most are not that powerful. They are often depicted as flaming balls."
—Shin Megami Tensei IV Apocalypse compendium
Mou-Ryo can be found in Shinjuku in the west entrance and west entrance buildings areas. Mou-Ryo can teach Nanashi the Mudo, Spirit Drain and Pulinpa skills through its Demon Whisper. Mou-Ryo benefits from learning Darkness and ailment skills. Mou-Ryo can transform into Inferno at level 28.
"Spirits of the dead who were unable to achieve Nirvana. They are strongly associated with water. Mou-ryo are part of the Japanese word "chimi-mouryo," which refers to evil spirits in general. They appear frequently in Japanese legends."
—Shin Megami Tensei IMAGINE compendium
Mou-Ryou can be contracted in Nakano, Kagurazaka Zhu Que Cavern, Ueno at night, and the Old Tokyo Metro. They appear in both silver and bronze levels of the Ichigaya Camp boss room and as a experience-boosting timed spawn in the main levels of the Hongou instance.