The Returned Warrior from the Second Dimension

The world is facing a huge crisis. How can the warriors who return from the second dimension transform into heroes and save the world? Is this world the real world, a parallel world or my own world? How should we use the power brought back from the second dimension? All the answers are in this novel. . . . This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.