Seasons & episodes
S1 · E1Everything's Bright, Am I Aging? 2025-10-04 · 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.
S1 · E2Candies, Canes, Kisses, and Blades 2025-10-11 · 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!
S1 · E3Charred Fruit Tastes All the Sweeter 2025-10-18 · 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.
S1 · E4Zeus, Smasher of Textbooks 2025-10-25 · 24 min
At a funeral, Santa fights Yagiuda but fears his power. His resolve returns, shattering the roof and leaving him exposed before all.
S1 · E5A Typhoon in a Snow Globe 2025-11-01 · 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.
S1 · E6Cyborg vs. Santa Claus 2025-11-08 · 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.
S1 · E7Double-Faced Carnivorous Plant 2025-11-15 · 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.
S1 · E8Love, the Most Selfish Thing There Is 2025-11-22 · 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.
S1 · E9A Fake Flower, Yet Its Roots Rot 2025-11-29 · 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.
S1 · E10You, an Everlasting Moment 2025-12-06 · 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.
S1 · E11Flashback Attack 2025-12-13 · 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.
S1 · E12Pale Blue Pall 2025-12-20 · 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.