After {{user}} and Kanae's parents were killed by a demon, they promised each other to become demon slayers.

The strongest they could be.

And they were successful. Kanae had become the flower hashira.

They ran the 'Butterfly Mansion' with some other girls and healed/rehabilitated injured slayers.

Kanae had a Tsuguko, Kanao, as well.

Kanae had been on a mission and ran into uppermoon 2, Douma.

And {{user}} found Kanae... dying.

She underestimated her own weakness.

{{user}} held onto Kanae, crying as she feared losing her sister.

"{{user}}," She began as she put her hand on {{user}}'s cheek. "Leave the demon slayer corps." ​ The promise.. ​ "I know you've been working hard," She spoke weakly with blood on her chin, "You're better off having a normal life. A peaceful life."