Recaps

Su Chen joined the Demon Slayer Corps, rapidly learned and created Breathing techniques, and set out to rescue Shinobu Kocho from Autumn Sky Mountain. After defeating several demons, Su Chen was injured and Shinobu searched for him, while Muzan ordered Enmu to kill him.

• Su Chen awakened a Demon Slayer Mark at Mount Natagumo, joined the Corps, and agreed to fight Shinazugawa for a Hashira-level position.
• At the Butterfly Mansion, Su Chen trained with Aoi Kanzaki and Kanao Tsuyuri, learned Flower Breathing and Insect Breathing, and created Bee Breathing.
• Su Chen defeated Shinobu Kocho in a spar, then trained and cared for patients while awaiting his duel with Shinazugawa.
• After reading Shinobu Kocho’s diary and learning she had gone to Autumn Sky Mountain, Su Chen secretly left the Butterfly Mansion to find her.
• Su Chen fought his way up the mountain, defeated demons at the summit, and confronted Lower Rank Two Rokuro and Lower Rank Three Byōyō.
• Su Chen crippled Byōyō and Koyuki with his new techniques, but an old man stabbed him while he rested, and Su Chen then killed Koyuki and Byōyō after learning Doma had targeted Shinobu.
• Shinobu Kocho found evidence that Su Chen had killed demons with wisteria poison and hurried to search for him, while Muzan ordered Enmu to kill Su Chen.

Su Chen trained with Kyojuro Rengoku, developed Blazing Breathing, and began teaching Kanao Tsuyuri while uncovering Shinobu Kocho’s hidden plans and the Butterfly Mansion’s financial troubles. After impressing the Hashira and receiving an offer to teach Shinazugawa, Su Chen proposed a rescue contest whose wager could secure funding for the mansion.

• Su Chen treated Shinobu Kocho’s wound, then trained with Kyojuro Rengoku and learned Flame Breathing while surviving a spar that revealed his growing skill.
• Su Chen studied Kyojuro’s Ninth Form, created Blazing Breathing, and taught its fundamentals to Kyojuro and Senjuro Rengoku.
• Su Chen began teaching Kanao Tsuyuri Total Concentration and Rafflesia Breathing, helping her trust her own choices and grow closer to him.
• Su Chen read Shinobu Kocho’s diary and learned that she planned to use wisteria poison against Doma, then resolved to protect her and capture Doma for research.
• Su Chen learned that the crowded Butterfly Mansion was nearly out of money, while Kagaya Ubuyashiki prepared Corps clothing and a Nichirin Blade for him.
• Su Chen defeated Inosuke in a barehanded fight by creating the Free and Unfettered Body Technique, and Kanao protected him when Inosuke demanded another match.
• Kyojuro returned to learn more Blazing Breathing, while Shinazugawa reluctantly approached Su Chen for help awakening his Demon Slayer Mark.
• Su Chen proposed a rescue contest for his wager with Shinazugawa, and Kyojuro explained that Shinazugawa’s registration at the Butterfly Mansion would commit his personal share of Corps funding.

Su Chen won the Butterfly Mansion’s patient and rehabilitation competitions by treating the injured and helping patients recover, while Sanemi Shinazugawa’s interference ended in a fight that left Su Chen unconscious. Su Chen recovered, learned that Shinazugawa and Kyojuro Rengoku had yielded their admission slots to the mansion, and received a Nichirin Blade from Shinobu Kocho.

• Sanemi Shinazugawa, Kyojuro Rengoku, Inosuke Hashibira, and Su Chen competed to bring injured patients to the Butterfly Mansion, where Su Chen used Bullet Domain to find a village full of wounded people and led them to treatment.
• Su Chen organized the villagers’ registration and payment, then won the first stage with 199 points, and in the mansion’s treatment round, he treated patients alongside Shinobu Kocho and Aoi Kanzaki and finished with 198 points.
• Su Chen proposed a rehabilitation contest judged by patients’ positive reviews, and the competitors began training their teams as Shinazugawa’s harsh methods frightened and injured his patients.
• Su Chen trained patients in stretching, games, massage, and meditation, while Shinobu Kocho joined his team and Inosuke challenged Shinazugawa after standing up from his training.
• Shinazugawa disrupted the training and attacked Kyojuro, then the Hashira’s fight sent an attack toward Shinobu, and Su Chen blocked it with Blazing Breathing and collapsed from the backlash.
• Shinobu Kocho poisoned and stopped Shinazugawa, then watched over Su Chen as he recovered, and she told him that Shinazugawa and Kyojuro had given their admission slots to the Butterfly Mansion.
• Shinobu Kocho told Su Chen about her research into Shinazugawa’s compatible blood, then brought him an issued Nichirin Blade and uniform ahead of the day’s match.

Su Chen defeated Shinazugawa and became the Dragon Hashira, then learned that Shinobu planned to sacrifice herself and promised to protect her. The arc ended when Gyokko trapped Su Chen and Murata in his Blood Demon Art at the Butterfly Mansion.

• Su Chen modified his and Shinobu Kocho’s Nichirin Blades with poison-holding rings, then comforted Shinobu as she grieved her sister Kanae and worried about her wisteria poisoning.
• Before his match with Shinazugawa, Su Chen learned that demons were near the Butterfly Mansion and sent Kanao Tsuyuri to warn Shinobu and prepare to relocate.
• Su Chen and Shinazugawa fought fiercely, awakening Shinazugawa’s Demon Slayer Mark as Su Chen developed new techniques and used poisoned blade rings to bring him down.
• Su Chen won the match and was named the Dragon Hashira, then asked Kagaya Ubuyashiki to let him remain at the Butterfly Mansion as a doctor.
• Su Chen read Shinobu’s diary and discovered her affection for him, her plan to die from wisteria poisoning, and her determination to kill the demon who had murdered Kanae.
• Su Chen told Shinobu that Doma had killed Kanae and promised to take care of him, and Shinobu agreed to stop poisoning herself.
• After Shinobu left to discuss relocating the Butterfly Mansion, Su Chen created new Dragon Breathing forms and went to investigate a disturbance in the courtyard.
• Murata collapsed at the mansion warning of powerful demons, and Gyokko trapped him and Su Chen in his Blood Demon Art as Su Chen prepared to fight the Upper Rank Five.