Hangyodon no Parallel Daisakusen: Mirai Sekai wa Oosawagi

Hangyodon and his friends are suddenly thrown far beyond their own time and land in a future world unlike anything they know. Before they can figure out how to return home, they become caught in a conflict involving extraterrestrial invaders.

Technology, aliens, and the confusion of being stranded in another era turn the journey into one escalating misadventure after another. Hangyodon must help his companions survive the future's troubles while searching for a way back to the life they left behind.