Ayaka's best friend, who also develops feelings for her. After confessing her true feelings to Ayaka, Risa vows to do her best to make Ayaka happy, wether or not it involves a relationship between them. She develops a slight animosity towards Hiroko, having her doubts about, if Hiroko is a good partner for Ayaka. even if Risa respects her feelings and choices. This confrontation also makes Hiroko reevaluate her attitude towards Ayaka.
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