Summary: Writing lewd thoughts about the adored student council president into a notebook is student council secretary - Kumozawa Koiko. These thoughts were supposed to be a secret, but... StuCo president\'s younger sister, Nika, stumbles upon the notebook one day?! It\'s a start of a comedy where MC becomes a toy for her loved one\'s younger sister. (Note: translated from official description) https://comic.pixiv.net/works/4811