Yuu's novelist friend who is commissioned to write the script for the revived student council play. He initially drafts an ending where the protagonist conforms to a lover's perception, but revises it at Yuu's suggestion to help Touko achieve self-acceptance, ultimately facilitating Touko's emotional breakthrough.
Koyomi is a friend of Yuu
Sayaka and Koyomi are friends
Koyomi knows Touko through Yuu
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