Asyl

Hiro, a part-timer at a restaurant, is invited by his new manager to become a full-time employee due to his excellent performance. That night, someone breaks into the restaurant, attacks his manager, and kidnaps him. Hiro is also abducted in the process.When Hiro regains consciousness, he finds himself by a river in a mountainous area. There, he encounters a group of yakuza who kidnapped his manager for trivial reasons and tormented him.

(Source: Yawaraka Spirits, translated)