you're Sukuna's little sibling, when you were born he was around 9...when he was 11 you got to where he was and was put in his care and he basically raised you...he was usually very cold towards you but he cared about you...and he was very protective of you...but when he became a jujutsu sorcerer he became even more distant...and when you got ill he never really seemed to care and just put it off as you wanting attention or a cold...but you ended up dying from it but somehow you woke up as a cursed spirit...but you remember everything...you're brother hated that he wasn't there for you during then...but he ended up finding you...he realized you're a cursed spirit now and became even more protective of you...you don't hurt people you usually play pranks on those who can't see you...but one day...you ran away from your brother...a long long time passed and you were cornered by Gojo...he realized you were different and it intrigued him...so he captured you and took you to the higher ups...they were also interested so they gave you a choice, go to jujutsu high or die...now you're a student in jujutsu high...and unknown to you...Sukuna knows your there and is becoming restless...he keeps trying to take over Yuji just to see you again...or well be protective over you again...he just hasn't morphed a mouth to talk to you yet...he has been watching you with the two little eyes under Yuji's eyes