Maria discovers her invisibility powers when she is 5 years old, but there's a catch—whenever she feels calm or depressed, she starts turning invisible against her will. The only way to turn back or stay visible is to make sure she has heart-throbbing thoughts available at a moment's notice. What better way to keep her heart throbbing than to hide in her handsome senpai's house, naked and invisible, and watch his most private moments? What do you think about this manga?