Arc 27Flower Sea and Circus Reform
William and Catherine traveled to Linghai seeking to restore Catherine's Nightmare Ability, fought Flower Sea Buddha Mother alongside Yi Chen, and returned to the Old World with new powers. Their joint dish strengthened Boss at the Demon Feast, after which circus reforms made fear collection the basis for choosing the next leader.
- William and Catherine helped the detectives fight the Boss, borrowed Guanyin the Child-Giver, and boarded a train to Linghai.
- William digested the unsealed idol through his Abyss, spreading a dark disease to its deity's connection before the group evaded quarantine inspections in Linghai.
- William, Catherine, and Fangfang reached Flower Sea Village, where William killed the Boss's Wife after she tried to sacrifice him and Catherine ate a replica idol to locate the Main Idol.
- William and Catherine entered the underground temple, where Catherine attacked the Flower Sea Buddha Mother and Yi Chen killed the village chief while William helped the investigators escape.
- William developed an Abyss Body and crushed the Buddha Mother's divinity, Yi Chen shattered her White Jade Bottle, and Catherine consumed her body with eggs until only a Sarira remained.
- Catherine returned William and Yi Chen to the Old World through dreams, and Boss revealed that Catherine and the Vibrio Sea subjects had been developed as vessels for opening a world passage.
- William and Catherine served abyssal instant noodles that restored Boss's strength at the Demon Feast, and Art won the competition after Yi Chen took control of William to eat his dessert.
- Boss divided circus operations among traveling departments with fear quotas, and William organized noodle production before learning that fear collection would decide whether he or Mr. Gian became the next leader.