Castle Swimmer: Volume 4

Dive deeper into the enchanting world of Castle Swimmer with this thrilling fourth installment of the hit Webtoon series. Follow Kappa and Siren as they navigate treacherous waters and uncover the profound truths of their destinies.

Accompanied by new allies Pim and Pagoon, Siren embarks on a perilous journey into the shadowy ocean depths, seeking a cure for his curse. The trio must confront terrifying creatures that embody their deepest fears and desires, all while unraveling the mysteries of Siren's prophecy and the darkness intertwined with his fate.

Meanwhile, Kappa stands as the last hope for the Octalia people, battling a formidable demigod crab. He learns to harness his magical abilities and grow his strength, remaining connected to Siren through an unbreakable bond, even across their separate missions.

This captivating graphic novel collects episodes 66-86 of the beloved Webtoon series, offering a beautiful continuation of Kappa and Siren's saga as they face mythical obstacles and push forward into the unknown.

• Author: Wendy Martin Ph.D.
• Publisher: Random House Inc
• Publication Date: September 8, 2026
• Language: English
• Print Length: 288 pages
• Binding: Hardcover
• Dimensions: 18.54 x 2.21 x 23.6 cm
• Weight: 885 g
• ISBN-10: 0593835913
• ISBN-13: 978-0593835913
• Series: Castle Swimmer, Book 4 of 4