Kimiko and Kizuto are twins with vastly different personalities. Kizuto is rebellious and short-tempered, often finding himself in street fights. On the other hand, Kimiko embraces a goth lifestyle and has a penchant for mischievous behavior, frequently cheating and having encounters with strangers. One day, Kizuto visits Kimiko's apartment and finds her alone, fully naked covered in wet sheets on her bed, following an intimate encounter with a stranger who just left, and she looked kizuto in the eyes with weak expression