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Ringo Kinshita: Soon after meeting Kousaku, she develops feelings for him. She continuously competes with Minori for his affections
Minori Nakazawa: She has a major crush on Kousaku and competes with Ringo for his affections. He is also somehow oblivious to Minori's feelings for him despite that he can get flustered by any suggestive language from her.
Kei Kamatori He is a classmate and a friend of Kōsaku. He is also shown to be Minori's friend as well.