Isekai is an anime and manga genre¸ where the characters are ordinary people from our world who have been unexpectedly sent to a fantasy world that is under threat from a powerful and invincible opponent. How did they get there? They may have been summoned by magic or divine powers¸ reincarnated due to a fatal accident — or simply appeared there. In any case¸ they live great adventures¸ learning to use their amazing new powers to ensure their victory and survival against the hordes of the demon king — or even the clutter of their fellow adventurers.