Attack of the Demon Lord Arc[]
Ryota is a student at the Freedom Academy in Class S. He and his classmates bully Rimuru when they are assigned to be their teacher. When Class S challenges Rimuru, they end up losing. Following Class S's defeat, they accept Rimuru as their teacher and start to bond with them. Rimuru also took them to Demon Lord Ramiris' domain to receive superior spirits to ensure their survival.
OAD[]
When an outdoor training session occurs, Rimuru provides them with a camping car pulled by a tamed Beast Gnome. A teacher named Tiss is assigned to watch over Class S. During their session, thieves ambushed them, but the students managed to defeat them. They also confront a Specter, but it is too powerful for them; however, the Primordial Noir saved them at the last second.
Human-Monster Interaction Arc[]
After learning that Rimuru is leaving, he and his classmates are saddened by the news, but they promise to visit ever now and then. From this point on, Tiss serves as their teacher in Rimuru's place.
Opening of the Monster City Arc[]
He meets Rimuru again alongside his fellow students and is invited to the festival in Tempest. There, he learns of Rimuru's true identity and also becomes friends with Hinata. He is later among the audience watching the martial arts tournament. He and the rest of Class S later had a meal during a break from the competition.