After the hard-earned funds for their expensive high school class trip are stolen, sophomore Yuichi and his four best friends are kidnapped by Manabu, a surreal character from a creepy late-night anime show. The mischievous Manabu challenges the students to a series of mind games that the five must decipher and outwit in order to win back their trip funds, uncover the thief, and pay off a huge and mysterious debt.

Shibe reels from the accusation that he has "actually killed a person." Despite protesting that he never did such a thing, he loses the audience's confidence and is thrust into first place. Meanwhile, Tenji finds himself in a distressing situation after realizing Yuichi is the one who wrote the card. Yuichi then makes the shocking announcement that he knows who the traitor is.

Yuuichi goes to help Kokorogi knowing it will be very dangerous, but things could turn out worse than imagined.