Nisekoi Doumei.

A classroom encounter after school reveals a betrayal when two people, each pretending to be in a relationship with the other, witness their actual partners stabbing them in the back. They begin a fake relationship as a response to this revelation, forming a partnership built on deception. Their dynamic is described as both sweet and painful, with hidden emotions surfacing beneath the surface of their fabricated romance. The story explores the tension between the lie they create and the genuine feelings that begin to emerge.