The Invincible Shovel (Manga) Vol. 5

DEEP-SEA DIGGING!Beyond the safe shores of the Lactia Republic, in the middle of the perilous ocean, echoes a voice only Lady Lucrezia can hear. The voice belongs to Elias, a mermaid of Lernia Hydra, who leads Alan and his companions deep into the sacred waters to seek out the Green Orb...and a message from Lucrezia's dead father!