As the two worlds collided, the demon king carried out his plan, leaving the legendary summoner hero die on top of his castle.

"It's not over yet!" the hero exclaimed, "Find me on that other world! Take him as your master and defeat the demon king."

After he said that, eight of his powerful subordinates traveled to that other world, found "that one guy", and picked him as their new master.

There was only one problem, though, the eight powerful subordinates couldn't be summoned for long in this new world, making this new guy have to constantly switch which person to summon in each battle he encountered.