Koishi Herikawa

A cheerful student and one of Kei’s most devoted companions, this grocery store heiress balances her daily food deliveries with a complex emotional life. While she deeply loves Kei, her heart is secretly entangled in a subtle, controversial affair with her teacher, Yamada. Her tendency to hesitate and suppress her true feelings ultimately leads to heartbreak, as her delayed confession arrives only after Kei has fallen irrevocably in love with Mizuho.