My Deliciously Guilty Yukito
One guy finds himself always getting dumped and having his best friend, pick up the pieces. On the night of one his classmates and ex girlfriend wedding, the best friends find themselves in another universe where being single is illegal. They partner up and the best friend started spoiling the guy who keeps getting dumped. The guy realize his best friend has always been there for him and starts falling for him. They end up together!! Although I love this story, it does seem rushed and we don't really see the relationship blossom, now that they both realize their feelings. Also, we don’t know how and why they were transported into another universe in the first place. A lot of assumptions made from this manga.
Yokubou no Shizuku