Dead Dead Demons Dededede Destruction (ONA) Episode 0

A gigantic alien craft appears over Tokyo Bay, plunging the city into a state of emergency. Nobuo Koyama, an employee at a publishing company, is caught in the chaos and loses consciousness as disaster unfolds around the descending ship.

When Nobuo wakes, eight years have passed and the world he knew has become a ruined reality remembered as "8.32, the Endless Summer Vacation." Worse, he learns that an invader had been controlling his body during those missing years. Refusing to accept that his old life is gone, Nobuo heads for Tokyo in search of his daughter Kadode and the family he no longer knows how to find.