Yuu and Keigo have been lovers for 10 years. Same sex marriage is still up for debate and while partnership among same sex partners are being made available, it remains to be difficult for actual partners to be open with their relationship. Yuu, for example, has already been abandoned by his parents when he admitted being lovers with Keigo. On the other hand, Keigo has yet to tell his mom and grandmother, fearing that it would ruin the loving and welcoming atmosphere they've already established with Yuu. In an attempt to take their relationship further, Keigo brings up marriage or at least partnership. Yuu rejected him and the growing friction that came from discrimination led to a fight and Yuu's confession of being abandoned. When they separated, not really break up, Keigo thought more about their relationship and the extra steps he has to take to assure Yuu that he is in the same boat as he is.
Torokeru Tamago to Bed no Naka de