Hane Aoba, a dependable senior office lady, finds herself caught between a distant boyfriend and the aggressive advances of her junior colleague, Sugaya Atsuto. Despite her guilt and attempts to resist, Aoba succumbs to her physical attraction to Sugaya, leading to a series of risky, clandestine encounters within the workplace. As their secret affair deepens, Aoba struggles to maintain her professional facade while Sugaya begins to set his sights on other colleagues.