Seisei Doudou Futamata suru Hanashi

Naoya just got confessed to by a cute girl—only problem is that he already has a girlfriend. His solution? To ask for his girlfriend's permission to two-time on her. From the creator of Aho Girl comes this silly, light hearted romance comedy about an open relationship characterized by passionate shouting, outlandish reasoning, and, in the end, adorable submission to all things cute!

(Source: Irodori Comics)