About this season
In near-future Japan with ultra-low birthrates, children are treasured but monitored. Santa is banned as dangerous. One snowy December 25th, middle-schooler Kazushige Sanda, descendant of Santa, is attacked by classmate Fuyumura who wants him to find her missing friend, Ono. "Santa, please find my friend." To protect children from adults, Sanda decides to become Santa and fight the adults.
Episodes (12)
1. Everything's Bright, Am I Aging?
7.3Aired 4 October 2025 • 24 min
On a Dec 25 without Christmas, Sanda is attacked by classmate Shiori. Mistaking it for love, he awaits her confession, but hears something else.
2. Candies, Canes, Kisses, and Blades
5.5Aired 11 October 2025 • 24 min
Amaya learns Sanda is Santa, restrains him and Shiori to force a kiss. Santa refuses, unlocks sled power to escape. Then Headmaster Oshibu appears!
3. Charred Fruit Tastes All the Sweeter
5.5Aired 18 October 2025 • 24 min
Sanda gains lie-detecting power. Shiori tries to use it to find Ono, but doubt overwhelms Sanda. Shiori then tells a self-harming lie.
4. Zeus, Smasher of Textbooks
6.7Aired 25 October 2025 • 24 min
At a funeral, Santa fights Yagiuda but fears his power. His resolve returns, shattering the roof and leaving him exposed before all.
5. A Typhoon in a Snow Globe
7.5Aired 1 November 2025 • 24 min
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.
6. Cyborg vs. Santa Claus
8.3Aired 8 November 2025 • 24 min
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.
7. Double-Faced Carnivorous Plant
7.0Aired 15 November 2025 • 24 min
Amaya ends his friendship with Sanda to save him. Meanwhile, the scarred Oshibu, comforted by Yagiuda, turns to Class 10 students who killed adults.
8. Love, the Most Selfish Thing There Is
8.0Aired 22 November 2025 • 24 min
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.
9. A Fake Flower, Yet Its Roots Rot
8.5Aired 29 November 2025 • 24 min
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.
10. You, an Everlasting Moment
8.5Aired 6 December 2025 • 24 min
At the Peak of Youth Ceremony, Niko steals Sanda's first kiss at twilight. Meanwhile Yagiuda faces Namatame alone, offering himself as decoy.
11. Flashback Attack
8.0Aired 13 December 2025 • 24 min
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.
12. Pale Blue Pall
7.5Aired 20 December 2025 • 24 min
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.