What kind of title is this?: Manga.
Where can I read it?: Reading links are listed for Kodansha USA, K MANGA, Pixiv Comic, Official Site. Check availability in your region.

Synopsis

About A Couple of Cuckoos

16-year-old super-studier Nagi Umino, second-year student at the Meguro River Academy high school, was switched at birth. On his way to a dinner to meet his birth parents, he accidentally meets the brash, outspoken, Erika Amano, who is determined to make Nagi her fake boyfriend as she never wants to actually marry. But once Nagi makes it to dinner, he finds his parents have decided to resolve the hospital switch by conveniently having him marry the daughter his birth parents raised...who turns out to be none other than Erika herself! (Source: Kodansha USA) Note: Fourteenth place of Tsugimanga 2020 Award in the Manga Category

Comedy Ecchi Romance