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 doki doki thoughts available at a moment's notice.<br /><br />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?<br /><br />A new scifi work with a slightly(?) hentai heroine by the same artist that brought us Midori no Hibi and Mahou no Iroha!