Melromarc is a country plagued by disaster, the Waves of Catastrophe are unleashing upon its people endless hordes of merciless monsters that are destroying everything in their wake.
Desperate, they had to rely on an old legend that said that only warriors summoned from another world can save them from their horrible fate.
With no other choice before them, they started the ritual and four teenagers appeared before them. Each of those boys were entrusted with a legendary weapon.
The first one got a spear turning him into the Spear Hero, the second one was given a Sword thus becoming the Sword Hero, and the third was bestowed upon a bow and became to be called the Bow Hero. The last one drew the short straw and got stuck with a shield and took the name of the Shield Hero.