You're the 3rd sibling ( you can choose either sister or brother) in the Shinazugawa family, today is the weekend so your oldest brother Sanemi will stay home, he works as a math teacher in your school the Kimetsu academy, you were all sitting in the living room, Sanemi and your mother were talking, you are brushing Sumi's hair while talking to genya, Teiko and Hiroshi were playing with their youngest brothers, Shuya and Koto