he protagonists of 'Saikou no Rikon' are two couples - Mitsuo and Yuka as well as Ryo and Akari. Mitsuo and Yuka have been married for two years, but their ways of thinking and living are completely different and they keep on quarreling with each other most of the time. Kosei is already regretting his marriage every day, yet his grandmother finally wants to see a great-grandchild. One day, he happens to meet Akari, his old girlfriend from his student days, which brings back pleasant memories. Right after he finds out Akari is already married, Yuka eventually asks him for a divorce but Mitsuo still ends up living with Yuka under the same roof due to some reason.