Asahi is a kind and devoted boy who was quiet and well-behaved, listening to his mother at all times and he did his best to support her physically and emotionally as a child. When Shio Koube was born, Asahi encouraged his mother to work hard for Shio because she became a symbol of hope for the both of them. He cared so much about his mother and Shio to the point where he urged his mother to leave the house with her and that he would stay behind with their abusive father so that he wouldn't pursue his mother.Due to his father's extreme abuse, Asahi grew resentful of adults and chose to never trust them. Further symptoms of this abuse include his gradual descent into a rage manifestation, especially whenever his actions relate to the search of his sister. Ultimately, however, he wants nothing more than to live a happy life with his mother and Shio, and unlike Satou Matsuzaka, he doesn't favor hurting people to achieve that; only when his close ones are hurt—in Shouko Hida's case, mortally—does he ever resort to such measures, a trait which stays when he is pushed over the edge upon finding Satou with Shio. "Hm...hi."