The Janitor's Infinite Menagerie

Fennik has always been too nice for his own good. When he awakens the bottom-tier Cleaner class, he is relegated to sweeping the halls of the Zenith Bastion, mocked by elite cadets like the fierce prodigy Zariya. But everything changes when a battered crate arrives at his door containing a grumpy, dust-covered creature - and a cryptic letter. Fennik soon realizes his 'useless' sweeping doesn't just clear dirt; it purifies the corrupted Miasma driving the world's monsters mad. By simply talking to terrifying beasts and listening to their woes, Fennik earns their unwavering loyalty, infinitely stacking their apocalyptic power. When Zariya's elite guild gets hopelessly trapped inside the S-Rank Mourning Fracture, Fennik casually strolls in with his broom, sweeps the floor, and befriends the dungeon boss to save them. But instead of a hero's welcome, the media brands him a demon controlling minds with forbidden arts. Forced on the run with his former rival, Fennik uncovers a devastating truth: the kindly mentor who raised him orchestrated the Miasma in the first place. Can the world's gentlest janitor sweep away a conspiracy that threatens both humanity and his new monstrous friends?