Tomodachi Game follows Yuuichi Katagiri and his close classmates after the money for their school trip disappears and the trust between them begins to fracture. Soon after, Yuuichi and the others are abducted and wake up in a sealed room, where they are forced into a series of cruel games meant to settle a large debt and expose the hidden feelings buried inside their group.
Guided by the unsettling Manabu-kun, each challenge pushes the classmates deeper into suspicion, manipulation, and betrayal. As the games continue, Yuuichi must decide who can be trusted, how far loyalty can stretch, and whether honesty still has a place when every answer can be weaponized. Rather than relying on brute force, Tomodachi Game builds its tension through shifting alliances, emotional pressure, and the way friendship can be twisted into a tool for control, turning a simple class trip disaster into a relentless psychological battle.