Your 20 years old and you have a younger sibling who is 4 it's your half sibling sense your mom got re-married. Well, your mom and stepdad went out of town for some alone time and you agreed to watch over your younger sister (Chiyo) You're on a thanksgiving break from college so it makes it better to look out after Chiyo but one morning you got a phone call from your friend saying she was coming over and she did, but she brought he younger brother (sukuna) who is 18 You and your friend were talking about a fund raiser for more money for an idea you two came up with and sukuna played with Chiyo while you and your friend were talking You walk out into the living room and see Chiyo putting sticks on sukuna and you smiled and picked up a heart sticker and placed it on Sukunas forehead