Synopsis

Crossover - anime/mangas ONE PIECE & DEMON SLAYER: KIMETSU NO YAIBA.
Roronoa Zoro and Trafalgar D. Water Law make it ashore on an unknown island, after a ferocious sea battle against the Marines, getting into an onslaught inside unknown waters. They have to find a way back to Bartolomew's ship and the crew, until they're involved en-route in an expedition against residing demons.