Knightmare

Sinopsis

Koyori Aisaki's dreams take an unexpected turn when her homeroom teacher, Mr. Grimme, appears in them as a knight. He warns her that her dreams are becoming dangerous, a consequence of her having given up on them, which allows darkness to transform them into nightmares. Mr. Grimme, now known as "Knightmare," acts as a guardian who eradicates these nightmares. Meanwhile, Masaya Katagiri, who has feelings for Koyori, experiences a mysterious voice in his own daydreams, hinting at a connection to the world of dreams and nightmares.