The adventures of a young spirit boy and his friends.

Haru Shinkai, a Junior High Student discovers an Appmon, which reveals himself to be Gatchmon and they become partners. Together, with other members, they plan to stop an artificial intelligence, Leviathan, from taking over humanity's.

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.

Kunon, a young man who cannot see, has the goal of creating new eyes with water magic. After just five months of learning sorcery, Kunon surpassed his own mentor and honed his talent as he tried to do a feat that's never been done before.