Chapter 0
While playing a ritual-like children's game called "Persona", students are knocked unconscious. While asleep, they encounter a man named Philemon who bestows several Personas upon them. When they wake up, the youths discover they can summon Personas.
Chapter 20
A standalone story set in the larger Megami Tensei universe. Our hero Hato is just an ordinary schoolboy, until one day he receives a ~~Command Spell~~ Stigma on his left hand, forges a contract with ~~Lancer~~ Cu Chulainn to become his master, and is unwittingly dragged into a city-wide Holy ~~Grail~~ War.