"Susume!! Pirates" is a manga series that blends adventure, comedy, and action, centered around a group of misfit pirates navigating the high seas. The story begins with the introduction of Captain Goro, a brash and ambitious pirate leader with dreams of finding the legendary treasure known as the "Ocean's Heart." Goro's crew is an eclectic mix of personalities, including the sharp-witted navigator Aya, the brawny but dim-witted first mate Jiro, and the enigmatic swordsman Kenta. Each member brings unique skills and quirks to the group, creating a dynamic and often humorous team dynamic.

The narrative unfolds as the crew sets sail on their ship, the Black Gull, encountering rival pirate factions, naval forces, and mythical sea creatures. Their journey is fraught with challenges, from navigating treacherous waters to deciphering cryptic clues about the Ocean's Heart's location. Along the way, the crew forms alliances with other pirates and outcasts, while also clashing with formidable enemies, such as the ruthless Admiral Ryoma of the Imperial Navy, who seeks to eradicate piracy and claim the treasure for himself.

As the story progresses, the crew's camaraderie is tested by internal conflicts and external threats. Goro's leadership is challenged by his own insecurities and the growing tension within the group, particularly between Aya and Kenta, whose mysterious pasts gradually come to light. The series balances its adventurous plot with moments of character development, exploring themes of loyalty, ambition, and the pursuit of dreams.

The climax of the story revolves around the crew's final confrontation with Admiral Ryoma and their race to uncover the Ocean's Heart. The treasure's true nature is revealed to be more than mere riches, holding a deeper significance tied to the history of the seas and the legacy of piracy. The resolution ties together the characters' personal arcs, offering a satisfying conclusion to their journey while leaving room for potential future adventures.