After being dumped by her boyfriend, Koyori went to her longtime friend Hijiri's house to drink away her sorrow...and ended up spending the night with him! Not only that, he tells her he loves her—and she's not sure how to reconcile the new development with someone she's known since they were kids. After all, the stakes are high—if things don't work out, she could risk losing it all. And to make matters worse, her ex wants to reconcile...? Koyori needs to figure out what she wants, before she loses it all.
Koyori and Hijiri are two people who grew up together as friends, and are now a couple, living together. But when both of their exes marries the other, the two begin contemplating their own “marriage.” But one time, in the midst of passion, Hijiri blurts out “Will you marry me”?! Is this… Can it be… A proposal?!