Protagonist: OOO

In the world of fantasy where the monster and demi-human exist, the world is different because they have four cardinal heroes wielding their weapons known as Sword, Bow, Spear, and Shield. They use their weapon to fight the Monster coming from the waves.

One hero who is known as the Medal Hero was a good hero a long time ago. A young man comes from another world found a book and transports him to another world where he meets four Cardinal Heroes and the king.

Now he will face the Wave with the power of Medal and with the help of Greeed. This is his story as the Medal Hero who will save the world.