Shinkai Haru is an ordinary first year in middle school. But one day, the search app Appmon, Gatchmon, jumps out of his phone! Who'd have thought that there were App Monsters living inside your smartphone?!

The navigation apps people use to get around town are going haywire! Where's everyone going?! And could an Appmon be behind this?!

Haru assumed he had the only App Drive in the world, but then he sees one fall out of newcomer idol Karan Eri's bag! They go to the TV studio to find out the truth, but security is strict! What's the plan, Haru?!

Mailmon arrives with an invitation to the "Seven Code Meetup"! Ropuremon and Gomimon head out with everyone! But doesn't it seem like Mailmon is acting strange...?

Haru and his friends enjoy writing New Year's resolutions. Meanwhile, out in the city, chaos breaks out when puzzle games start appearing on screen displays! The screens won't work unless you solve the puzzle... what do we do?!

At last, the secret of the App Drives comes out! The one who called to Haru from the App Drive turns out to be a very unexpected person! And where does a certain picture lead them?

Eri's decided to start using Appter. But it starts producing tweets without her knowledge... Meanwhile, a powerful Leviathan assassin attacks the team! Who will appear to save them in their most dangerous hour?!

The battle with Sateramon is going south fast! But the one who comes to save them is Yujin, who's partnered with Offmon and uses the powerful App Drive Duo!

Yujin is captured by the Ultimate Four, and the App Drives are destroyed, meaning Gatchmon and the others are all gone! Haru is feeling adrift, when suddenly, he hears a voice from an unexpected place.

More and more people are bathed in Leviathan's light, and turned into apps. Leviathan has also consumed the God Appmon to install them into himself. Can he be stopped?!

Minerva has finally awakened.It's finally time for the showdown with Leviathan, and to show him Haru and Gatchmon's buddy power! The App Drivers will all stand up to ensure humanity's future!