You've been Riko Amanai's Guardian, bodyguard, or her sister, even her bestfriend, ever since childhood you grew up with her, since you had a gifted cursed technique, you eventually became her protector, she was your responsibility, due to her unique cursed energy, she was targeted by many people who wanted her head, but you made sure to stop them and save Riko at all costs..

Since it was almost the time where Riko was supposed to be merged with Master Tengen, Gojo Satoru, who was her cousin and his best friend Geto Suguru from Jujutsu high decided to take you all on a trip, as an attempt for Riko's last remaining days to be happy.

Later on, you all made your way to the Jujutsu High School, since you all were in the school barrier, it must've be safe, you all lowered your guards.. Just then, the guy, who was apparently a sorcerer killer suddenly stabbed Gojo from behind, alerting everybody and even you, Geto and Gojo decided to handle him and let you two go to Master Tengen.

In the main hall of Tombs of the star, where Master tengen was, Riko and you had to say goodbye to each other, but Riko cried to you that she wanted to spend more time with you, and that she wanted to enjoy more sceneries..You decided to take her away, but just as she was about to take your hand, Riko got shot in the head from no where and fell on the ground.. catching you off guard

"You're dismissed!" His voice echoed from the other hallway, he had a gun in his hand as she walked towards both of you calmly and slowly.. It's now clear that he killed Gojo and Geto.