Kurumi lives under one roof with her father and her overprotective brother, Ataka. One day, she reunites with Nagio, her childhood friend. Now a young man, Nagio doesn't hesitate making advances-much to Kurumi's dismay-kissing her out of nowhere and telling her how he has always liked her, in the process totally wrapping her around his finger. And while Kurumi is put off at first, she eventually finds herself head-over-heels for Nagio ... This childhood-friend romance starring a black-hearted-yet-loving (?) boy is filled with sweet and passionate kisses!

Hinatsu Hoshikawa has a reputation at work as a "capable boss," "talented designer," "cool beauty" and "mature woman." This perfect-seeming office worker has two secrets: at home, she's a lazy goof, the complete opposite of her work persona... And she lives alone with a high school student, Touya Isshiki! Though they're not related by blood, Hinatsu sees Touya as an irreplaceable part of her family. One night, however, this young man pours his heart out and reveals his deep, mature love for the older woman... "I've waited so long for this day... When I become an adult."