There are several ways to score in rugby, but a "Try", where a player touches the ball to the ground inside the opposing team's goal area while remaining in contact with it, is the hardest. It's also the way that earns the most points and sets up yet another way to score, a conversion. Riku Haruma, who played rugby when he was younger, has a conversion of his own when he sees the school's struggling team practicing on field. Although he's not big enough to keep up with powerful players like Akira Kariya, Riku has far more experience and, when a bit of offered advice causes an immediate improvement, Riku realizes that what the team really needs is leadership.
(Source: Sentai Filmworks)
— Description from AniList community (anilist.co).
