HENTAI YOKU DEKIMASHITA

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. — Description from AniList community (anilist.co).