Rika Niikura, 28, is currently hiding the fact that she has feelings for the young company president Satoshi Kojima. The two of them were friends as kids and were reunited by chance at Satoshi's company, but he doesn't seem to remember… Rika, on the other hand, still thinks of him as her first love. Everyone's getting married and having kids, and she knows she's falling behind, but…! With all that on her mind, a young yet dependable new employee, Takeshi Kiryuu, joins the team. Rika is charged with training him. She realizes that the gentle boy will be an asset, but then she lets her guard down…! She receives a passionate booty-call on the night after they just met, and he asks to be her pet!! What on Earth does that mean!?