The special characteristic of this sword is that it can be combined with demons or other swords (depending on the game) to produce a stronger sword. It is also dropped by certain demons.
Shin Megami Tensei IMAGINE
Katana of Renki can be acquired through drops in early dungeons, including treasure chests in Nakano Stone Site's bronze-level instance, or through the swordsmith chain expertise. Through special synthesis recipes with demon crystals, it is possible to create Blade of the Wind God, Blade of the Thunder God, and Blade of Flames.
Devil Summoner: Raidou Kuzunoha vs. King Abaddon
The sword used as the basis for all Sword Fusion. New swords can only be made by acquiring more.