The second season of Kakkou no Iinazuke. 
Umino Nagi and Amano Erika were born on the same day and swapped at birth. Nagi was raised as the son of a diner owner, and Erika the daughter of a hotel tycoon. Their parents encourage them to become engaged, and they begin life together. Soon though, infatuations arise as Nagi becomes stuck in a love quadrangle. Life and love are embroiled in epic turmoil as fate is set in motion once again!
 
(Source: Crunchyroll)

Episode 4 -  I See You're All Together

Episode 3 - That, but Times A Hundred

Episode 2 - Onii Confessed to You, Didn't He?

Episode 1 - Who Was Umino-kun's First Love?

KADOKAWA

Okuruto Noboru

Kodansha

Crunchyroll

BS Nittele

Bit Grooove Promotion

A Couple of Cuckoos Season 2