Shô Hirano

Nao is normally shy at school. It is a surprise when Taiga propositions her for a date and eventual marriage. Nao means to say 'no,' but says 'yes' instead not knowing how to reject such a proposal. Taiga has always come across a scary and larger-than-life. They should not have judged a book by its cover though. (imdb)

Rin, Yuu, Koyomi and Keita are friends in high school who live in the same apartment building. Rin and Yuu like each other, but they don't tell each other, until Kazuma shows up. (themoviedb)

In the senior high school division of Shuchiin Academy, student council president Miyuki Shirogane and vice president Kaguya Shinomiya appear to be a perfect match. (wikipedia.org)

The film portrays the events of the original manga's "Sports Festival and Cultural Festival" arc, focused on Yu Ishigami and Tsubame Koyasu. The arc was also portrayed in the second season of the anime. (animenewsnetwork.com)