The System is from the game Cultist Simulator. You don't need to have played it to follow the story.
I'm Xia Tui, and I've transmigrated into Jujutsu Kaisen.
Bad news: My fave is gone.
Good news: I brought my fave's cotton doll with me.
What? I have a System? For real?
Seeing the familiar game cards, I feel like I could surpass the Star Religious Group, revive my fave, and reach the pinnacle of the jujutsu world any second now.
Facing the oppressive presence of 285:
"Could you speak English?"
Facing the three layers of terror on the card:
"This is bad!"
Facing Sukuna's slashing attack:
"I've torn up one card, and there are still 736 left. Keep it up!"
Most characters will be killed off.
Updates whenever inspiration strikes.
Theme: A beautiful new world