Rei Furuya and His Unfortunate Boyfriend

Karasuma Yuki is a person who lives in the darkness but still loves life. Abandoned by his parents, he holds no grudge; when someone casually saves his life, he offers them his loyalty; when his teammates oppose him at every turn, he escapes one deadly predicament after another with them on his back. He is utterly loyal to the organization, taking his targets' lives in an instant. He has his own definition of justice: never kill ordinary people or children. Karasuma Yuki traded a lifetime of misfortune for a passionate, but not sincere, love. (Note: Short story)

Theme: Fate decided my whole life