Kimetsu no Yaiba: One-Winged Butterfly

Kimetsu no Yaiba: One-Winged Butterfly (の: の), written by Aya Yajima, is the second light novel spinoff of the Kimetsu no Yaiba manga.

On February 14, 2022, Viz Media announced that it, along with The Flower and Happiness and Signs from the Wind, would receive an official English release. It is the second of the three to be published in North America.

Chapter 1: One Winged Butterfly ({{Ruby|片|かた}}{{Ruby|羽|はね}}の{{Ruby|蝶|ちょう}})
Following the death of their parents, Shinobu and Kanae return to Gyomei Himejima's home to express their gratitude for saving them. Unwilling to peacefully live out their lives, they beg Gyomei to take them as apprentices in order to become Demon Slayers. However, he is left uneasy about introducing the young girls to the world of Demon Slayers. To compromise, he gives them a proposition: if the girls can move a boulder, he will introduce them to cultivators, allowing them to decide their fate.

Chapter 2: The Right Way to Recommend a Hot Spring ({{Ruby|正|ただ}}しい{{Ruby|温|おん}}{{Ruby|泉|せん}}のススメ)
While undergoing training with Tengen Uzui, Zenitsu is left drained of energy from the constant breatment. For his final task, Tengen instructs Zenitsu to dig out a hot spring and persuades him that he will be able to join the mix gendered bath with his wives. Excited by the chance of bathing with women, Zenitsu sets out to quickly accomplish the task, while tricking Inosuke to help him as well.

Chapter 3: Mitsuri Kanroji's Secret ({{Ruby|甘|かん}}{{Ruby|露|ろ}}{{Ruby|寺|じ}}{{Ruby|蜜|みつ}}{{Ruby|璃|り}}の{{Ruby|隠|かく}}し{{Ruby|事|ごと}})
Mitsuri feels a sense of guilt after learning of Shinobu's reason for joining the Demon Slayer Corps, and comparing it to her own reason. Feeling horrible over her selfish intentions, she proceeds to avoid the members of the corps on purpose. Having sensed a change in Mitsuri's behavior, Obanai speaks to Shinobu to try to figure out what's wrong and cheer her up.

Chapter 4: After Waking Up From a Dream ({{Ruby|夢|ゆめ}}のあとさき)
Following the battle at the Swordsmith Village, Genya is being treated at the Butterfly Mansion for his injuries. He intervenes after a corps member takes out his frustration on the girls, and recalls his temperament as a child. During his youth, he ran away from their abusive home only to be tracked down by Sanemi. Despite being disowned by him, Genya opens up to Sumi about his kind older brother.

Chapter 5: For You Who Does Not Smile ({{Ruby|笑|わら}}わない{{Ruby|君|きみ}}へ)
After Tanjiro regains consciousness following Giyu's spar with Sanemi, he makes small talk with Giyu, causing him to recall the events of a Hashira Meeting. During this meeting, Gyomei Himejima informs the Hashira &mdash; excluding Giyu &mdash; that their leader, Kagaya Ubuyashiki, has made a special request for them to make the Water Hashira "smile". Some members try to formulate a plan, while others openly oppose, all in an effort to complete their leader's request.

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