In order to repay a huge debt that he suddenly incurred, Katakiri Tomoichi (Uki Ukisho), a second-year high school student, was kidnapped along with four friends and participated in a mysterious "Friend Game". The guide who appeared in front of Tomoichi and his friends said that this game "can be easily passed as long as there is friendship". However, due to the appearance of a traitor, they began to suspect and launched a psychological warfare under extreme conditions. Although they can only be saved by winning the game, friendship can easily collapse. Tomoichi made a plan to find the traitor. And, in the vortex of their respective secrets and dirty thoughts, Tomoichi's past and "true nature" gradually become clear. Moreover, who started the "Friend Game" and why, the mystery is getting deeper and deeper. @哦撸马（阿点）