Jujutsu Kaisen: Trapped Beast

I still dream about that scene. When I was five, the Jujutsu Sorcerer who saved me died a death of such exquisite, tragic beauty. From his scalp to his neck, his chest to his waist, his thighs to his ankles, his skin was covered with tiny pink, flesh-colored pits left by the suckers of tentacles. Delicate, faint threads of blood laced each little pit, like the petals of a gorgeous rose. His pale lips, contorted with pain; his elegant temples, slightly sunken; the sorrowful, bashful blush that rose in his cheeks as he choked... But in that captivating death, what fascinated me most was the small, bloodied patch of his belly. The skin there had long since vanished without a trace, and at last, the crimson flesh deep beneath the sinews had the chance to announce its existence to the heavens. It bubbled merrily, while a rainbow-fragmented stream flowed from it into the dusk. I absolutely have to become a Jujutsu Sorcerer. If I can't be killed like that, I'll have wasted my entire life. Pairing undecided. Villainous heroine, but very dark and twisted, adored by all. Probably first person. The blurb should make it clear that the heroine isn't mentally well, so please don't leave comments calling her crazy or anything like that. It would really bother me. Theme: Don't give up