Atsushi is Hikari's older brother, a calm person who always gives Hikari his honest opinion. He is currently a high school junior attending a regular high school. Unlike Hikari, he dislikes fighting and has avoided physical altercations and shouting since childhood. This stems from an incident when they were very young: Hikari saw Atsushi beating up a boy who had hit her, and his facial expression was so terrifying that she fainted. However, if he feels his sister is in danger, he abandons his peaceful nature and will not hesitate to beat someone up. Even now, Hikari becomes terrified whenever he gets truly angry.
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