The story starts with the three brothers, Zeus, Poseidon, and Hades attacking the Gigantes which was released by a mystery enemy. The weapons of the two of the three brothers, Zeus' Thunderbolt and Hades' Invisible Helmet are being robbed by the enemy by using some power. To get back their weapons, the three brothers go to the underworld but accidentally fall into it. Then, Poseidon suddenly wakes up. The battle is just a weird dream of Poseidon.