My Butterfly Can't Bear to Kill the Ghost King Wuhan Alone

[Single or double heroine + make up for regrets + no system + self-created breathing method + daily life] After traveling through time and becoming Butterfly Ninja's childhood sweetheart, Tenno Nagatachi chose to join the Demon Slayer Corps in order to protect his sister. He pioneered the Breath of Darkness and became the youngest Dark Pillar of the Demon Slayer Corps. Coincidentally, when he had just become a pillar, he encountered a ghost attacking the Butterfly Ninja family... Amano Nagatachi: Shinobu is optimistic, this sword will be very handsome. Cut off the upper string, capture the lower string, please bask in the sun without mercy, this generation of ghosts will end in my hands!