Honkai Impact 3rd's Sirin Gets Stronger by Fighting in Jujutsu Kaisen

A girl is forced to be reincarnated into Jujutsu Kaisen to fight Sukuna, and becomes Sirin, the Herrscher of the Void. Every time she defeats a powerful enemy, she earns points that she can spend on various abilities and equipment from Honkai Impact 3rd. So she turns into a ruthless min-maxer who will do whatever it takes to win, becoming a true no-holds-barred fighter. "The reason Six-Core Sirin struggles is that she just doesn't know how to play." She puts Megumi Fushiguro under pressure, summons Mahoraga, and uses Might of An-Utu to score points with instant kills. She summons Titans with the Herrscher of Reason core, avoids Idle Transfiguration, and turns Mahito into hand-pulled beef balls. Mahoraga isn't giving her enough points? She makes Itadori bring Sukuna out to spar with Mahoraga, then steals the kill once they've trained enough. She puts Megumi Fushiguro through a special training regimen: in the middle of a crowd, he either opens his Domain or gets sent through fake portals until he's sprawled all over the place. Hajime Kashimo loves fighting? Send him to the Sendai Colony to take on the Four Heavenly Kings. Whoever doesn't have a Domain will be embarrassed. Want to eliminate the curse problem? How about the Stigmata Project? If everyone falls asleep, no curses can be born. Neither side agrees? I'll pour their soy milk right at my feet! When Sukuna awakens, he'll have to face Sirin, who has collected every Herrscher core. "Sukuna, you're the challenger!" "You're nothing but a village-fight champion born in an era without me."