Taiga, a teenage girl with a complex about her aggressive nature, has just moved to Tokyo when she runs across a boy passed out from starvation. She lends him a drink, but he ends up stealing a kiss! Then, on her first day at her new school, that boy, Anri Iseya, comes up to her and declares himself to be her pet?! This dangerous mission between a black beast and a strong-willed 16-year-old begins now!