Umeka Shôji

The story takes place in Okinawa, where Haruka forms a beach volleyball pair with Kanata. Kanata, who couldn't handle the pressure put on her by her short height, had given up on beach volleyball already, but is convinced by Haruka to step back on the sand once again and aim for the junior tournament. (imdb)

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.