Kojiro

Beneath Tokyo lies "Ura-Tokyo," a shadowed counterpart to the city we think we know. There, a secret academy trains exorcists to battle evil spirits. After entering the forbidden grove of Madara Shirazunomori Forest, Soma Kuroniwa is cursed to harbor a spirit of exceptional danger. Hiding his true nature, he enrolls in the academy and throws himself into its brutal training program—one with a graduation rate of only a few percent. When a powerful spirit draws near, the inhuman force sleeping inside him awakens. Source: K Manga

Golden Future Cup Entry No.4 Survive in the Frozen World! It has been 20 years since the last major snowstorm in the world. But then, snow covered the city and giant monsters called "Snowmen" came to every corner of the world and devoured humanity. (Weekly Shonen Jump 2021, No. 48)