A 34-year-old hikikomori is kicked out of his home by his family after the death of his parents. After his eviction, he saves a group of teenagers from being killed by a speeding truck, but loses his life in the process. When he comes to, he realizes he has been reborn as Rudeus Greyrat, in a world of swords and sorcery.

Natsusa Yuzuki entered university expecting to be the rugby club's ace, but he can no longer play rugby due to certain circumstances. Ibuki Ueoka is a senior who also quit playing rugby. There is also Yasunari Tsuru, Natsusa's junior who finds him disagreeable. On the other hand, another junior, Yuu Mashiro looks up to Natsusa and follows in his footsteps. Last, there is Seiichirou Shingyouji, Natsusa's childhood best friend. This is an original rugby anime of former teammates who fight together in matches of Kansai's university rugby league.

Komura starts his school year with a new seat neighbor in homeroom—the bespectacled Mie. Before long, he's nursing a raging crush on his quirky classmate who's always forgetting her glasses! While this might be ideal for Komura to get to know Mie better, will his poor heart give out from the daily strain of being up close and personal with the girl he likes?!