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When a cultist group called the Shomonkai begins experimenting with Demon Summoning, causing Demons to begin appearing in Tokyo, the government responds by initiating a lock-down of the area inside the Yamanote Line, a train line that encircles a section of Tokyo. Other than the Demons, the Abrahamic God, YHWH, also has a hand in the lock-down, reasoning that humanity attempting to use demons for their own ends means they must be put through God's Ordeal.
Meanwhile, three high-school friends, Yuzu Tanikawa, Atsuro Kihara, and a Protagonist named by the player, are given a COMP each (a portable multimedia device that resembles the 3DS) by the Protagonist's cousin, Naoya, each equipped with some odd features. Chiefly, there's the Demon Summoning Program, which allows the three of them to form contracts with demons, and fight on even terms with them. The Government's lock-down is to ensure no COMPs escape the Yamanote Line.
Other features of the COMPs include the Laplace Mail, a prophetic ...