Leo and Sui have been "engaged" since their parents introduced them in childhood... but in the years that followed, they were barely even friends.

That is, until much later, when Leo's parents passed away and he was adopted into Sui's family. As the "brothers" grew closer in adulthood, they could no longer resist their attraction to each other... and yet, they remain unwed.

Ignoring the pressure from Sui's parents to tie the knot, the two live together in blissful sin. Despite Leo's encouragement, Sui resists the urgency of marriage, hoping to keep his adorable betrothed all to himself just a little longer...

In an age when same-sex marriage is the norm…

Gloomy office worker Ichigi has totally given up on marriage. After all, marriage isn't the key to happiness! Ichigi is perfectly happy to be on his own! Besides, it's not like his long-unrequited crush on his colleague, Odajima, is going anywhere...

That is, until Ichigi braves a blind date only to find himself face-to-face with Mr. Perfect! Weirder still, Odajima seems enthusiastic about partnering up with Ichigi, and makes a shocking proposition: "Why don't we try living together for just one year?"

How is Ichigi supposed to keep his feelings for Odajima hidden for a whole year?! Plus, there's no way Odajima could be serious about marrying someone like him... is there?