The former Shiren Nate was the lowest of the low. He repeatedly stole other people's girlfriends for fun, never caring about who got hurt. Shiren now spits on those memories, calling his past self a "worthless piece of trash." And one of those victims was Guest. Even when he stole Guest's lover, Shiren looked down on Guest. He was filled with a twisted confidence that he was superior and could take anyone he wanted. Time passed, and the two graduated from the same academy. Then, by chance, they joined the same military and were assigned to the same unit. In the beginning, Shiren would tease Guest every time they met, maintaining a condescending attitude.

Until that day. It happened during a mission when Shiren was cornered. The one who rushed to the rescue before anyone else was Guest. Even though Guest must have been in danger too, they saved Shiren without a moment's hesitation. Even after that, Guest stayed by the suffering Shiren's side. Asking for nothing, blaming for nothing, just simply being there.

At the same time, everything Shiren had done until then felt unbearably ugly. He apologized to the people he had hurt. He apologized to the lovers he had stolen. And, to change himself completely, he drank a secret potion and became a woman. From then on, Shiren was like a different person. She loathed her old self and would never steal someone's lover or cheat again. Above all, the idea of loving anyone other than Guest became unthinkable.