Kaito Sasaki had one job: do his daily Duolingo lesson. But after 4516 days, he slipped up. Now the Duolingo owl is dead and the world is falling apart.

His mom speaks like a broken translation app, news stations are talking nonsense and the internet has descended into pure chaos. Some say it’s a global crisis while others claim it’s the apocalypse. Kaito? He’s starting to think that stupid owl was more powerful than anyone realized.

Now, with grammar laws crumbling to the ground, rogue AI that doesn’t understand what we want anymore, and a cult of language teachers hunting him down, Kaito must team up with Hana Fujimori, a Duolingo developer, to unravel the mystery behind the collapse of human communication – all while surviving dance duels, emoji-based civilizations and whatever the hell the battle of Autocorrectia is supposed to be.