Kimetsu no Yaiba: One-Winged Butterfly

Kimetsu no Yaiba: One-Winged Butterfly (鬼滅の刃: の Kimetsu no Yaiba: Katahane no Chō) is the second light novel series from the Kimetsu no Yaiba (Manga) written by Aya Yajima.

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 as a corps member. He gives them a proposition saying that if the girls can move a boulder, then he will introduce the girls 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, Mitsuri 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 whats wrong and to try 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.