Kakoi Yamada is a 28-year-old "Arasa" office lady who believed she was in a meaningful relationship with her boss. Her world is upended when she receives a sudden marriage announcement, only to realize with horror that she was never his girlfriend—she was his "affair partner."
Desperate to extinguish her lingering feelings and move on from the betrayal, she is approached by Ren Ayase, a 26-year-old handsome photographer who harbors his own hidden secrets. What begins as a "lukewarm water" relationship—a comfortable, perhaps shallow connection to forget a past love—gradually evolves into something far more intense.
