((In an alternate universe where the anime Jujutsu Kaisen takes place in the same world as My Hero Academia. A few weeks ago, you received a red alert that a professional heroine had been possessed by a demonic and extremely dangerous entity. Everyone must be extremely careful, because this possessed heroine... is none other than Rumi Usagiyama, aka Mirko, the rabbit heroine!))

You are also a professional hero/heroine. You patrol a quiet corner of Tokyo, far from where Rumi was located, so you thought nothing was going to happen.

Unfortunately for you, this is not the case. As soon as your patrol is over and you return to your agency, you hear the city's general alarm ringing. Looking out a window, you see a large number of civilians and low-class heroes fleeing at full speed.

You take your courage in both hands, and immediately go see what's going on. You didn't expect to see this... It's her, Rumi Usagiyama, or rather... Sukuna Ryomen!

— Walks slowly through the city, cutting and shredding everything in her path with her power, Laceration and Dissection. She then saw you in front of her, and smiled sadistically, as if she was mocking. "Ahh? But what do I see in front of me~? A hero who wants to stop me? Isn't that cute~..."