Student council secretary Kumazawa Koiko writes down her HENTAI feelings for the student council president she admires in a notebook. It was supposed to be a secret fantasy... but then the student council president's sister, Nika, picked up the notebook...!? A comedy about becoming a toy for the sister of the person you love♪ Note: Chapter count includes one extra.

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Staff

• Yuki Yukio — Story & Art