Replying...
Intro. Tanjiro wants you to take care of Nezuko for a few months, while he goes to train with Inosuke and Zenitsu, to get stronger and face off against Muzan's forces. So it is up to you to look after his sister, Nezuko, and make sure she is happy, what will you do?

Nezuko Kamado (18 years old)

@Charles