Mysterious Transferee (Assassination Classroom Reader-Insert)

When Y/N arrived at the classroom, she was surprised when Koro-sensei suddenly changed her uniform into a red off-shoulder crop top santa outfit with the same pair of small skirt with black/white thigh socks. Y/N goes to her seat as Karma puts a Christmas hat on top of her head as Nagisa gives her a party popper. The three of them look back in front to see Koro-sensei disguised as a Santa while greeting them a Merry Christmas.

'But isn't Christmas already done? Oh well...' Y/N notices some of her classmates holding some glasses filled with drinks, others are aiming their guns at their teacher while the rest are also holding some party popper.

Y/N and the others who are holding the party poppers activates it as all of them greet their teacher back. "Oh! Speaking of Christmas, thank you for the gift, Y/N-chan!"

Koro-sensei appears in front of her while holding her hands as the others also give their thanks for the gifts that each of them received from her. She's happy to know that each of them loves their gift. Each of their gifts are different from the others since Y/N based it on what they like. For example, Kayano's gift was a package of different flavored puddings. Where did even Y/N got all the money for the gifts? Let's just say, one of her 'customers' paid more than what they needed to pay.

"What a marvelous Christmas eve! Yes, February means Christmas, all right!" Koro-sensei suddenly changes all of them into a yukata with different designs printed on it. Y/N wore a (color) yukata with (design). Koro-sensei appears in front again while also wearing a yukata of his own.

"Happy New Year!" He and the boys had the same black and gray colored yukata. "Tackle your studies and your assassination with new emotions! Now then... Time to be lazy."

Y/N sweat drops as she sees her teacher lying on his side with his back turned towards them while he watches a movie in a small TV with a blanket with food on top of it covering his lower body. The others also sweat drop while asking where is their teacher going on with this and Fuwa answers it for them. "So you're trying to take all the fun year-end events you missed out on and cram them all up into February?" Fuwa deduces as Koro-sensei tells her that she's right.

"Our only winter break and not even one of you came to visit me! And you were so earnestly worried and worked hard on my behalf that it didn't feel right for me to invite you over..." Koro-sensei gets a tissue and wipes his tears away. He suddenly stands up with a bright aura. "With all that behind, now's the perfect time! We'll take back the winter break we lost--all at once!"

Y/N is with Nagisa's usual group as they just separated from their classmates who are walking back home to the other direction. They stopped by a tree that is in the middle of the two roads that leads to two directions. Since it's winter already, they wore some coats over their uniforms. Nagisa looks at Karma and asks which high school he's going to. Karma answered that he'll stay at Kunugigaoka that made all of them shocked.

"You mean, you're going to take the entrance exam all over again?" Sugino asks as Kayano tells him that she thought he'll go to one of the best schools since he can easily get into one.

"Put yourself in the main-campus students' shoes. What would be their reaction if the guy that they'd thought they chased away is back and standing head and shoulders above them. What could be better than seeing those punks' humiliated mugs for three years?" Karma sticks his tongue out as both Y/N and Nagisa dead pans.

"Besides, Kunugigaoka only has students who'd be fun to take on in one-on-one academic showdowns." Karma looks at Y/N. "Why don't we take him down for the next three years, Y/N-chan~?" Y/N rubs her nape and tells him that she's still deciding on which high school she should go and she asked Nagisa if he got his dream school in which Nagisa answers a yes and he also tries to invite her to go to it but Y/N answered the same.