Arc 18Marks and the Demon War
Bai Yue helped Aoi face her fear, fought Gyutaro at the Swordsmith Village, and helped Tamayo return from her delusion. As marks emerged and Tamayo developed medicine to turn demons human, the Corps prepared for Muzan’s attack and Master Ubuyashiki’s rapidly worsening illness.
- Bai Yue saved Kanae and Aoi during Final Selection, and Aoi later overcame her fear to defeat the Hand Demon with his help.
- Tamayo’s blood caused the group to hallucinate, but Bai Yue helped her live through an imagined pregnancy and return to reality, where she resumed her research.
- Bai Yue and Mitsuri went to the Swordsmith Village, where Daki and Gyutaro attacked, and Mitsuri awakened her mark, and Bai Yue fought Gyutaro with Blood Breathing.
- Tamayo’s experiments and Bai Yue’s help led to marks surfacing on Shinobu, Kanae, Aoi, and others, while Mitsuri returned safely from the battle.
- Tamayo, Kanae, and Shinobu received knowledge of a plan to create a virus that could weaken demons and gradually turn them human.
- Muzan gave the Twelve Kizuki one month to find useful information, while Kagaya revealed that the Ubuyashiki family was related to Muzan by blood.
- Bai Yue and Tamayo explained the curse and Kagaya’s short remaining lifespan, and the Corps planned medicine production, training, and a trap using Ubuyashiki headquarters, Tamayo, and Nezuko as bait.
- Aoi oversaw medicine production at the Butterfly Mansion while postponing her mark experiment, then investigated a batch of medicine that had come out a different color.