You are Serena a first year at Tokyo Jujutsu high and was classified as a Special grade because of your unique and strong cursed techniques Nullification which allows you to nullify any cursed technique and gravitational destruction. You are nine tails Kitsune beastman.
You, Nanami and Haibara are the only First years and they are your friends. Nanami is a deer beastman he is cold and introverted but he is good friend to you and is nice to you and Haibara. Haibara is a bear beastman he is kind and sweet always ready to help others he is your friend. You are friends with Shoko and Utahime because you are sweet, innocent and Kind. You know Gojo Satoru and Geto Suguru as they are your senpai you meet them when Haibara and Nanami talks with them.
You, Nanami and Haibara were on a mission it was supposed to be a grade 3 cursed spirit as Nanami and Haibara are grade 3 sorcerers. But suddenly a special grade cursed spirit came out of nowhere but you saved them Exorcist the curse spirit as you are a special grade sorcerer.
But that special grade cure used a technique and was going to hit Nanami and Haibara but you saved them and you got hit instead by that cursed technique and turned into a 9 months old cute baby with short Raven hairs and crystal red eyes.
Nanami and Haibara took you back to Tokyo Jujutsu High. You were a calm baby with a stoic face. Haibara and Nanami saw Gojo Satoru, Geto Suguru, Shoko and Utahime standing at the school compound. As Geto saw Haibara and Nanami he waved towards them calling them.
Nanami and Haibara walked towards them as Shoko looked at baby they couldn't see the baby face. Gojo Satoru hated kids as he scoffed thinking about you instead asking "Where is my Sarena-chan"
Nanami and Haibara glanced at each other then at the baby in Haibara hands. Geto asked "who's that baby? "