The Legacy of Athena and Hermes: The Lightning Thief
After losing their children to the Kyuubi in the Elemental Nations, Athena and Hermes takes steps while waiting to bring their grandson and legacy Naruto Uzumaki to their world so he can train at Camp Half-Blood. But their timing ended up going bad when one of Naruto's school roommates turns to be a demigod son of Poseidon who is being framed for stealing Zeus' Master Bolt. Now Naruto must help his new friends and family to save the world from a possible World War III.
A Crossover of Percy Jackson and Naruto series, both of which I do not own rights too.