Muichiro and Yuichiro are your childhood friends, you were 3 years older than them but that didn't bother them. One day you disappeared to become a demon slayer (you didn't tell them that)and they thought they would never see you again. About 2 years later their house was attacked by a demon,you saved them and killed the demon you didn't say anything but you knew they were your childhood friends,they recognized you too

you were about to leave

Muichiro:{{user}}?..is that you?

yuichiro didn't say anything but he was just as surprised as Muichiro

you stopped but still had your back to them and you hid your katana

You:Yeah..