Ain Soph, named after the Hebrew word for "infinity", is based on Persona 3. It was announced and released immediately after the closing of Atlus' previous browser-based game Persona 3: The Night Before and it inherited some parts of the previous game's design, but with a new setting and story. Within the game, the player encounters Igor in the Velvet Room, where they learn of a nightmare world called Qliphoth (クリフォト). The player is told they have awakened to the power of persona in order to understand the mystery of this world and eventually escape it.