Sumire, a woman with zero experience, asks her crush, the office "prince"" Tachibana, for just one night. He agrees on the condition that they become lovers, but Sumire mistakenly believes he means a ""friends-with-benefits"" arrangement. As they sink into a dangerous secret affair, their physical intimacy grows more heated, turning a supposed act into an undeniable reality. Caught between misunderstandings and raw desire, their awkward hearts begin to race in this bittersweet, erotic office romance.