The Fourth Calamity Only Wants to Slack Off in the Jujutsu World

Short version:

Wangyue Yao logs into a Jujutsu Kaisen crossover game.

His technique is bizarre and overpowered, and he's gentle but a little unhinged.

He thinks Satoru Gojo and Suguru Geto are fellow players,

until one day he suddenly realizes:

This isn't a game. He's the real Fourth Calamity.

Expanded version:

Wangyue Yao wakes up to discover that he's logged into an ultra-realistic, immersive game called "Jujutsu Kaisen."

With gray-blue curls, icy blue eyes, and a silver hoop in his ear, he has a gentle, clean-cut face, but the most bizarre and ridiculous cursed technique on the server.

Other people fight with cursed energy, shikigami, and Domain Expansion.

Wangyue Yao fights like this:

"System, turn on Easy Mode."

The curse that was raging with murderous intent a second ago immediately wilts into a pitiful little thing.

[Passive: Player's Instinct]

[Skill: Quick Loot]

[Skill: Friendly Interaction]

[Skill: Lower Difficulty]

[Ultimate Skill: Undetermined]

Others: That technique is cheating!

Wangyue Yao: Just the basics, just the basics. I'm only here to slack off and grind affection points.

On his first day at school, he smiles sweetly at the three people in his year:

"I'm Wangyue Yao, a Fourth Calamity by profession. My goal is to collect SSR teammates and max out their affection."

Satoru Gojo: ?

Suguru Geto: ...Fourth Calamity?

Shoko Ieiri: ...I knew you weren't normal.

Eventually, everyone realizes:

This boy who keeps talking about "games," "the System," and "teammates"

isn't a player at all.

He's a real calamity who came crashing in from beyond the world.

Also known as "My Technique Is Even More Unreasonable Than Satoru Gojo's," "All My Classmates Are My Gaming Buddies," and "Turn On Easy Mode and Even Curses Behave."

Theme: Break the rules with kindness, and overcome hardship with companions.