Soshiki no Shukuteki to Kekkon Shitara Mecha Amai

Roushi and Ritsuka once fought against each other on opposing sides of rival organizations. After many bloody battles, the two are now loving married, always telling each other "I love you" and never miss a kiss before going out. Roushi is enjoying his happy family life, but is troubled by the fact that he and Ritsuka have not yet gone all the way yet. This is a sweet newlywed comedy about two former enemies. "Yesterday's enemy is today's wife!"

(Source: Natalie, translated)