Episode of Pandora - Mix Speaker's,Inc.

Episode of Pandora
translation

In a far off time, in an era of old, there existed demons who controlled the world.
However, that period could not long continue, and six heroes sealed the demons into "Pandora's box."
Demons who, sealed so they could never again revive into the present day to settle old scores and dye the world in fear, have been freed from their existence on the reverse side of history.
Now, open the curtain on the story that crosses time itself.