Nanatsu no Maken ga Shihai suru S01

In the world of magic, there exist irreversible techniques known as "Spell Blades." These rare and mysterious spells, along with those who wield them, are shrouded in an aura of mystery, and everyone is aware of their absolute lethality. Every year, the blooming of the trees heralds the arrival of new students to the renowned Kimberly Magic School. A spectacular display of magical creatures, accompanied by awe and fear, welcomes the new students to the school. Among these new students is the enigmatic Oliver Horn, who becomes infatuated upon seeing a particular girl, a girl dressed in unusual attire and carrying a Japanese sword on her back. After the entrance ceremony, Oliver realizes that everything at Kimberly is not as he imagined, and the appearance of mazes, monsters, and other threats puts the new students in danger.