Jujutsu Kaisen: I Have a Cursed Technique of Causality

[Slightly overpowered protagonist + growing male lead + no System + mostly battle arcs + starts with the Hidden Inventory Arc + causality-based cursed techniques + many original characters and cursed spirits]

[Note: The protagonist's technique may be a little hard to understand, but that won't affect your enjoyment. You can read while ignoring the causal links.]

Su Helin transmigrated into the world of Jujutsu and was born into a branch family of the Zenin, one of the Three Great Families of Jujutsu Sorcerers. He was given the name Zenin Helin. This was the Jujutsu world he knew, but not entirely, because it also contained many Jujutsu Sorcerers and Curse Users never mentioned in the original story, numerous powerful organizations, the Ten Calamity Cursed Spirits, and several legendary cursed spirits besides Ryomen Sukuna:

King of Cursed Objects: Yamata no Orochi

King of Jujutsu: Susanoo

King of Curses: Ryomen Sukuna

Although he was a member of the Zenin family, he never inherited the Zenin's Ten Shadows Technique. But he was born with enormous cursed energy, and not long after enrolling at Jujutsu High, he awakened his own technique: Causality.

This causality-based technique transcends the rules of the world, and is also equivalent to those rules.

“Domain Expansion? I'm afraid no one can escape the laws of causality. Therefore, I, Zenin Helin, hereby demand that Sukuna die!”

“Are you the strongest because you're Satoru Gojo, or are you Satoru Gojo because you're the strongest?”

“You're wrong, Suguru. Perhaps the strongest should be Helin.”