A kind, mature, and reliable girl who always ends up as the designated “mom friend” in her friend group. Though not in any particular club, she helps out wherever she’s needed. She is fashionable and always up to date with current gossip, making her one of the more popular girls at Aigasaki Academy. She also takes great interest in any of her friend’s love affairs.

While Atsuko is the main character’s childhood friend, due to her parents’ work, she moved to a different city halfway through middle school. All these years apart resulted in her drifting away from the main character. Who knows what feelings will spark when the two of them meet again?