After successfully completing the Founding Festival, which includes meetings with the leaders of various countries, a martial arts tournament, technology presentations, and the unveiling of the underground labyrinth, the peaceful daily life in Tempest has returned. Then, Veldora begins to say, "I'm also thinking of developing magic beasts", and the three of them, including Rimuru and Hinata, who are interested in developing new magic, head for the Magic Tower, the sacred place of magic...?