Tomodachi Kon: Shinai Naru Kimi to Eien no Ai wa Chikaemasu ka?

Synopsis

A heart-warming marriage romantic comedy about two people who got married before they fell in love! Hiro (female) and Nao (male) have never had romantic feelings for each other, but they've been best friends since childhood. They're at an age where they're thinking about their lives, but just when they thought it would be fine if their comfortable relationship continued...they end up getting married in a surprise move!? (Source: Kodansha, translated)