Season 1
7.7/10342 votesEverything's Bright, Am I Aging?
Season 1 Episode 1 - Aired 10/4/2025
On a Dec 25 without Christmas, Sanda is attacked by classmate Shiori. Mistaking it for love, he awaits her confession, but hears something else.
Director: Tomohisa Shimoyama
Writer: Kimiko Ueno
7.4/10226 votesCandies, Canes, Kisses, and Blades
Season 1 Episode 2 - Aired 10/11/2025
Amaya learns Sanda is Santa, restrains him and Shiori to force a kiss. Santa refuses, unlocks sled power to escape. Then Headmaster Oshibu appears!
Director: Rushio Moriyama
Writer: Kimiko Ueno
7.6/10211 votesCharred Fruit Tastes All the Sweeter
Season 1 Episode 3 - Aired 10/18/2025
Sanda gains lie-detecting power. Shiori tries to use it to find Ono, but doubt overwhelms Sanda. Shiori then tells a self-harming lie.
Director: Takuya Yoshihara
Writer: Kimiko Ueno
7.8/10199 votesZeus, Smasher of Textbooks
Season 1 Episode 4 - Aired 10/25/2025
At a funeral, Santa fights Yagiuda but fears his power. His resolve returns, shattering the roof and leaving him exposed before all.
Director: Tomohisa Taguchi
Writer: Kimiko Ueno
7.8/10191 votesA Typhoon in a Snow Globe
Season 1 Episode 5 - Aired 11/1/2025
Sanda vows never to love, but in a typhoon his message to fiancee Niko fails and he's drawn to her. The next day, Yagiuda arrives as a teacher.
Director: 佐藤伊予
Writer: Unknown
8.2/10174 votesCyborg vs. Santa Claus
Season 1 Episode 6 - Aired 11/8/2025
Santa blocks Headmaster Oshibu from attacking adult Ono, but the enhanced 92-year-old overpowers him. Santa asks the kids for their belief to fight.
Director: Akitoshi Yokoyama
Writer: Kimiko Ueno
7.5/10145 votesDouble-Faced Carnivorous Plant
Season 1 Episode 7 - Aired 11/15/2025
Amaya ends his friendship with Sanda to save him. Meanwhile, the scarred Oshibu, comforted by Yagiuda, turns to Class 10 students who killed adults.
Director: Shugo Tsuneoka
Writer: Kimiko Ueno
7.5/10145 votesLove, the Most Selfish Thing There Is
Season 1 Episode 8 - Aired 11/22/2025
Saved from Namatame by Shiori, Santa vows to harden his heart, but when Niko asks for a kiss, Sanda panics and almost transforms before her.
Director: Mari Motohashi
Writer: Kimiko Ueno
7.7/10138 votesA Fake Flower, Yet Its Roots Rot
Season 1 Episode 9 - Aired 11/29/2025
Tetsudome says Santa lacks grit. With her aid Sanda becomes dark Santa, but doubts himself. After meeting Namatame again, he vows not to fight kids.
Director: Takuya Yoshihara, Asami Murakoshi
Writer: Kimiko Ueno
7.9/10136 votesYou, an Everlasting Moment
Season 1 Episode 10 - Aired 12/6/2025
At the Peak of Youth Ceremony, Niko steals Sanda's first kiss at twilight. Meanwhile Yagiuda faces Namatame alone, offering himself as decoy.
Director: Unknown
Writer: Unknown
7.6/10120 votesFlashback Attack
Season 1 Episode 11 - Aired 12/13/2025
Namatame wrecks the ceremony. Eating yakisoba, she's met by Sanda in child form. His body starts breaking down as Ono's own changes grow.
Director: Unknown
Writer: Unknown
8.0/10125 votesPale Blue Pall
Season 1 Episode 12 - Aired 12/20/2025
Santa fights Oshibu before the students. The headmaster thrives on cheers, but Santa regains power by revealing his truth. The duel peaks on the roof.
Director: Tomohisa Shimoyama
Writer: Kimiko Ueno