The Beautiful Assassin and the Radiant Knight

Mirei is the youngest assassin in an assassin's guild, a boy with such delicate and beautiful features that he is often mistaken for a beautiful girl. On a certain assignment, he disguises himself as a woman and sneaks into a ball, where he successfully kills his target. However, on his way back, he encounters a man with porcelain-white beautiful features in the mansion's garden. Mirei attempts to kill him immediately, but the tables are turned, and he is forcibly violated by the man. Mirei decides to take revenge on this nameless man, but meanwhile, the beautiful man seems to have taken a liking to Mirei...