SANDA manga volume 1 features story and art by Paru Itagaki, the creator of Beastars!

In a future where youth is preserved out of necessity, there is no time for trivial celebrations like Christmas, until Sanda Kazushige awakens the legendary power of Santa Claus. He and his best friend, Fuyumora Shiori, stumble upon a bizarre world of magic while searching for their missing classmate - all while navigating the terrors of Middle-School.