12 episodes · first aired 2025-10-04
| Still | # | Title | Overview | Air date | Rating |
|---|---|---|---|---|---|
 | 01 | Everything's Bright, Am I Aging? 2025-10-04 | On a Dec 25 without Christmas, Sanda is attacked by classmate Shiori. Mistaking it for love, he awaits her confession, but hears something else. | 2025-10-04 | 7.3 |
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Ratings shown are community scores. Once OMDB is wired, these become per-episode IMDB values.
| 02 |
Candies, Canes, Kisses, and Blades 2025-10-11 |
Amaya learns Sanda is Santa, restrains him and Shiori to force a kiss. Santa refuses, unlocks sled power to escape. Then Headmaster Oshibu appears! |
| 2025-10-11 |
| 5.5 |
 | 03 | Charred Fruit Tastes All the Sweeter 2025-10-18 | Sanda gains lie-detecting power. Shiori tries to use it to find Ono, but doubt overwhelms Sanda. Shiori then tells a self-harming lie. | 2025-10-18 | 5.5 |
 | 04 | Zeus, Smasher of Textbooks 2025-10-25 | At a funeral, Santa fights Yagiuda but fears his power. His resolve returns, shattering the roof and leaving him exposed before all. | 2025-10-25 | 6.7 |
 | 05 | A Typhoon in a Snow Globe 2025-11-01 | 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. | 2025-11-01 | 7.5 |
 | 06 | Cyborg vs. Santa Claus 2025-11-08 | 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. | 2025-11-08 | 8.3 |
 | 07 | Double-Faced Carnivorous Plant 2025-11-15 | Amaya ends his friendship with Sanda to save him. Meanwhile, the scarred Oshibu, comforted by Yagiuda, turns to Class 10 students who killed adults. | 2025-11-15 | 7.0 |
 | 08 | Love, the Most Selfish Thing There Is 2025-11-22 | 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. | 2025-11-22 | 8.0 |
 | 09 | A Fake Flower, Yet Its Roots Rot 2025-11-29 | 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. | 2025-11-29 | 8.5 |
 | 10 | You, an Everlasting Moment 2025-12-06 | At the Peak of Youth Ceremony, Niko steals Sanda's first kiss at twilight. Meanwhile Yagiuda faces Namatame alone, offering himself as decoy. | 2025-12-06 | 8.5 |
 | 11 | Flashback Attack 2025-12-13 | 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. | 2025-12-13 | 8.0 |
 | 12 | Pale Blue Pall 2025-12-20 | 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. | 2025-12-20 | 7.5 |
