Lin Wan, a history student, was familiar with the history of the Taisho Demon Slayer Corps. Once he traveled through time, he became a weak branch girl of the Utsuyashiki family. Suffering from lung disease, she cherishes the oath to rewrite the tragedy, and vows to use modern knowledge to assist her lord and protect those young lives that are destined to wither - especially the insect pillar butterfly ninja who is as beautiful as a butterfly but has a short-lived fate.
She anticipates crises, improves medicines, optimizes tactics, and tries to turn the tide at plot points. But I never thought that her appearance itself would be the biggest change: the Butterfly Ninja's probing eyes became increasingly intense, Tanjiro's journey took an early turn, and the conspiracy of the Kamigiri Oni was quietly rewritten. When the predetermined destiny on her handbook was crossed out one by one, when the gentle bond intertwined with the cruel battle, on the way to turning things around, she gradually couldn't tell whether to protect others or to break away from the shackles of fate with Shinobu.
The warm and healing daily life of the Butterfly House, the thrilling demon-slaying battle, the delicate bond of two-way redemption, in the storm of the Taisho period, a journey of destiny rewriting set off by the time traveler is slowly unfolding. And those secrets hidden in the shadows of history gradually surface as the plot shifts...
