Asou Ayataka, who had been living in a small indigenous village in the Andes, returns to Japan for the first time in five years—bringing along his adoptive little sister, who has become a target of the local mafia. Arriving at school two weeks late, Ayataka goes to an empty classroom after school, where he is reunited with two girls. One is Miyazu Mirai, his first love and childhood friend. The other is Masaki Nadeshiko, a beautiful girl with jet-black hair. She was the one who once gave Ayataka a deep trauma and became the reason he left Japan to go abroad.

A hero in South America—but in Japan, just a slightly unfortunate boy. This is the story of him and the girls around him.