Regeneration of a ghost

Memory

"What do you mean who I am? We met yesterday you know!" Muichiro took a look at the man in front of them and push him away. 

"Stay away from [Y/N] nii-san/nee-san." Yuichiro came out from the room after finish dressing up and saw the unfamiliar man at the door. 

"Mui, who's this?" 

"Dunno, they said they know nii-san/nee-san." [Y/N] took off the [F/C] apron and pull the twins away from the door. 

"Sorry but I don't know you. Mind introducing yourself?" 

Daki exist her room and saw the white-hair man outside their dorm door. She didn't think twice and dialed Uzui's number from her phone.

'Hello?'

"Hello, Uzui-san. There's a weird man harassing [Y/N] nii-san/nee-san in front of our dorm right now."

'... I'm on my way.' 

[Uzui think of [Y/N] as a little sister/brother that need to be protected at all cost]

Not even 3 seconds later, there's the sound pillar in the flesh. 

"Uzui-san! What brings you here?" the [boy/girl] watch as the sound pillar drag Gojo down the hall and Obanai waiting at the end of the hall with a match on fire.

[Y/N] shrugged and close the door, enjoying their breakfast.

[Time skips~~~]

[Y/N] grab their books and katana before heading to the office, announce something that they thought it's a good idea. 

"I'M BRINGING YOU ALL TO A FIELD TRIP!" 

Sanemi actually spit out his coffee and scream back.

"YOU WHAT?!"

"You're serious?!" Rengoku asked. 

"Yep!" The cheerful [H/C]-nette said. 

Sabito who is listening the whole time immediately ran back to his class and told them all about it. After that [Y/N] went to announce the good news to their students. 

"Everyone~ I have good news~" The [boy/girl] said.

"We know, we have a field trip." Sabito said. 

"And~ We're heading to our destination now~! Along with the second years and first years~" this surprised everyone.

They all gather up at the school field including the sorcerers, Gojo hid behind the tree watching how they transport 

'So what will you do, [Y/N]-san?'

[Y/N] drew a circle around the group before stepping in as it glow [F/C].

"Reverse Time: Taisho Era Location: Mugen Train" The circle glow brighter and brighter until they all disappear into the bright light.

Gojo look shocked after the light disappear, leaving no trace when they left so he decided to asked his students about it after they return.

[Meanwhile with [Y/N]]

The light dimmed as the scene became clearer. An object suddenly flew over to Nezuko and [Y/N] threw a knife as it stuck onto a wall. 

"Ah. Watch out of flying flesh~ Oh look! There's Nezuko-chan! And Zenitsu-san!" 

Past Nezuko is getting held back by the flesh of Enmu. 

"Doing great Nezuko! Now onward to our next location! Rengoku-san's dream!" 

"Wait, [Y/N]-sensei! How can we enter a dream though?" Itadori asked.

[Y/N] turn to Itadori with a smile on their face and said, "Easy! And please call me [Y/N], sensei make me feel old."