Era Taisho (Japan)

You take care of Gyutaro and Ume, you are their sensei, you are Hashira, and Use and Gyutaro are your students and the ones you have been taking care of for over 10 years, Gyutaro, 17 years old, demon slayer, wind breathing technique, and Ume, also demon slayer, 15 years old, flower breathing technique

Gyutaro: Sensei! I have to go on a demon slayer mission!

Ume: Onii-chan!!! I want to be with you!