Shinkon seikyōiku: Seifuku no hanayome (2006)

Asuka (and Tatsuya, childhood friends who promised to marry each other since they were kids, finally get married. However, the school Asuka attends is also the same school where Tatsuya, now a teacher, has been newly assigned. Akiko, a classmate who has a crush on Tatsuya, Goro, who is infatuated with Asuka at first sight, and Manami, a neighbor who is on the verge of exploding with frustration and unilaterally pursuing Tatsuya, all catch wind of their relationship, leading to a huge commotion.