Second season of Hyakushou Kizoku.

Ever since she was a child, Himari Aozora has adored the world of the idol princesses known as AiPri. Long ago, Himari made a promise with her best friend, Mitsuki Hoshikawa, that they would debut as AiPris together. However, Himari has grown to be incredibly shy, and she has all but given up on her dream. Both girls enroll as first years at Paradise Private Academy. On the first day of school, Himari gets lost on her way back to the dormitory and stumbles upon a room radiating a pink light. She falls into the room, and a bracelet clasps onto her wrist, transporting her to the AiPriVerse—the world where AiPris perform. Himari accidentally enters the newcomer auditions for the AiPriVerse, and her performance impresses Paradise Academy's Student Council. They offer to become her producers, with the condition that she will conceal her status as an AiPri. Little does Himari know that Mitsuki herself is also an AiPri and has been hiding it from her! Their childhood dream of performing together gradually comes to fruition—even as the academy's principal threatens to ban AiPri from school grounds entirely.

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)