Synopsis

A friend confronts the main character, suspecting he's hiding something due to his unusual strength and rapid skill acquisition. They decide to exchange secrets, where the friend reveals she is a girl disguised as a boy due to her family's traditions. In turn, the main character admits he is a regressor, who has died and returned to the past. Despite the shocking nature of the revelation, the friend accepts it, solidifying their friendship and leading to a transfer of internal energy.