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.

Responsible for the theft of the class funds, the application to play Tomodachi Game, and the exposure of all kinds of dirty secrets in Bad-Mouth Sugoroku, Tenji now tries to alienate Shiho from the others so he can have her all to himself. As a result of his attempts, a rift develops between Shiho and Yutori that threatens to destroy their friendship. But while Tenji is busy sweet-talking Shiho and planning his next move, a "special chance" appears for Shiho that might change the direction of the game.