Five years into their marriage, Rei and Tetsugaku have always maintained a strong and loving relationship, rooted in their childhood friendship and mutual support. However, this summer, the shocking discovery of Tetsugaku's infidelity leaves Rei heartbroken and deeply shaken. Compounding her distress, their attempts to conceive have been unsuccessful, fueling growing anxiety about their future together. At this fragile moment, Tetsugaku's father, Dango, announces he'll be staying at their home while on a business trip to Tokyo. Dango, who has always shown kindness to Rei since their hometown days, reenters her life in a profound way. As she gradually feels drawn to him, Rei realizes she's begun subtly seducing him. Coming to a fateful decision, she takes a bold step forward—heading to Dango's place, ready to embrace a new chapter.