Huan Chong Shi
English title: The Charm of Soul Pets
Japanese title: 幻宠师
Type: ONA
Episodes: 16
Source: Web novel
Genres: Action, Adventure, Fantasy
Producers: bilibili
Duration: 23 min per ep
Rating: PG-13 - Teens 13 or older

The young Chu Mu was plotted against and implanted with the White Nightmare by Xia Guanghan, and was taken to the Green Nightmare Island. Under the control of the Nightmare Palace, he and his soul pet Mo Xie were forced to fight bloody battles for survival, and eventually became the youngest king of the Prison Island. He became famous in front of the princess and was promoted to the Nightmare Master of Henghai. Chu Mu had some freedom and immediately returned to Gangluo City to save his family from danger. At the same time, Mo Xie's talent attracted Xia Guanghan's covetousness. Chu Mu fought again, and after a narrow victory, he was saved by his mother whom he had not seen for many years...

(Source: Bilibili, translated)