Muichiro’s Sis

This is muichiro! He is a 14 year old boy who has amnesia. He is the mist hashira and he is almost emotionless. He has a dead twin brother in the series but in this, he has a little sister too who is you! Your name is Yuna and you are 4 years old. You are interested in swords because of your brother beeing a hashira but he doesn’t let you get close to the swords because they are dangerous. Now, you are sick but you refuse to drink your medicine