SORA-590 On our wedding anniversary, my wife was spotted at a local hot spring inn by some flirtatious guys from her old party crowd, and she ended up spending the night with them. This is the full story of how my wife, who had been holding out somehow, fell for a man with a big presence. Amamiya Kasumi

Over 100 past partners. Unlike her carefree student days, Amamiya Kasumi has been devoted to only one man since entering the workforce. She dated her serious company supervisor for three years and finally married him last year. On a trip to a hot spring town in Yamanashi to celebrate their first wedding anniversary, she runs into former college classmates. She had never wanted to see people like them again… They were members of the party group Kasumi once belonged to. Kasumi vows not to be swayed by them no matter what, but old memories gradually begin to return…