Transmigrator Leon becomes a clownfish in Atlantis and unlocks the Deep Sea Devour Evolution System. Adopted by Blue-Tail Clan chief Po, he is despised by Cecilia. He evolves by devouring sea life and sparks conflicts between sea lords. The Sea King covets his royal bloodline, planning to extract his marrow.Leon escapes to Olympus border city and meets Athena’s priestess Isabella. He saves his clansmen in the arena and reaches Rank A with the clan relic. He defeats the Sea King, seizes Poseidon’s power to hit Rank S, ends tyranny and blood prejudice. After stabilizing ocean order, he leaves for Mount Olympus to take the Divine Trial.