ロザリオとバンパイア [Rozario to Banpaia / Rosario + Vampire]

In Rosario + Vampire, a human boy named Tsukune Aono is accidentally enrolled at a school for monsters, where he must navigate a world of vampires, werewolves, and other supernatural beings while keeping his own humanity a secret. This 2004–2007 series from Shueisha, originally serialized in Monthly Shōnen Jump, is best known for the work of creator Akihisa Ikeda, who blended romantic comedy with monster-of-the-week action. Its 10-issue run established a popular blend of harem comedy and dark fantasy that later expanded into an anime adaptation, making it a notable entry in early 2000s shōnen manga.