In Okinawa, Ayaka Kurenai was born in the world's greatest legendary karate family. When she was a child, her family was attacked by a mysterious gang that seeks a legendary black belt. Her father Sojiro was killed and her younger sister was taken in front of her. Time has passed. In Yokohama, she was spending her life as a normal high school girl, hiding her real name and her status as an heir of the legendary Karate family. However, one incident brought her a fateful encounter with her sister who was separated in their childhood. But, her sister was raised as a heartless killing machine by the mysterious gang who took her... (Source: Letterboxd)