Double Marriage

In future Japan, bigamy is legalized! Specifically, each person may legally marry two spouses, a simple legal change that brings up a lot of questions about serious romantic relationships. What would long-term relationships be like if they didn't remove you from the dating pool? Would people be more willing to commit if they knew they could also pick someone else later? Would society really jump to accept this as a new social norm, even if it had become legal?

Ikuta Naosuke, a married man, bumps into a classmate from middle school, Itou Yuko, who's had a crush on him. Yuko has grown up to be a pretty nurse, and Naosuke begins to have an affair with her. With the new bigamy laws, Naosuke wants to marry Yuko, too. ...