“I remember this! I’ll never forgive you!” Hirao’s childhood friend, Naho Kusano, caught two fraudsters when he was in sixth grade. Hirao happened to witness the fraudsters being taken away, and he worried that they might harm Naho after their release from prison. After much deliberation, he decided to train himself at a martial arts dojo on the outskirts of town to prepare for that day. However, as Naho began to frequent the suspicious dojo, Hirao started to distance himself from her, feeling uneasy about her involvement. Even if Naho disliked him, he was fine with it as long as she could enjoy her daily life. Until that day arrives, Hirao dedicated his life to protecting Naho. And one day during his second year of high school…