Castle Swimmer: Volume 2

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Author(s)

Wendy Martin

Publisher Name

Ten Speed Graphic

Genre(s)

Age Range

14+

Release Date

June 03, 2025

ISBN13

978-0593835845

ISBN10 or ASIN

Two mermen reject their destinies and embark on a raucous adventure as big and unpredictable as the ocean itself—and a romance that nobody could have predicted—in the stunning second installment of the hit Webtoon series Castle Swimmer.

The sharks want Kappa dead, and time is running out for Prince Siren to save him. Queen Susca knows Siren doesn’t have the courage to kill Kappa, and for the sake of the kingdom, she’s willing to do the deed herself. As tensions run high, neighboring queens pay the sharks a visit to offer an alliance, and while they might just be the means of escape the two mermen have been looking for, it’s unclear if they can be trusted.

Siren will do anything to get Kappa to safety—even if it means never seeing him again, and even if all Kappa wants is to stay by his side. Yet escaping the queen’s spear will take all of Siren and Kappa’s courage and cunning, and there’s no guarantee they’ll both make it out alive.

This beautiful graphic novel collects episodes 20-41 of Webtoon's Castle Swimmer and includes a never-before-seen bonus chapter featuring Kappa and Siren.

Editor review

1 review

A Touching Story with a Unexpected Twist

May 28, 2025 (Updated: June 15, 2026)

Overall rating

5.0

Writing Style

5.0

Plot

5.0

Characters

5.0

Illustrations/Photos (if applicable)

5.0

What I Liked: This book takes place right where the events of book 1 left off and leaves you with a cliffhanger, making you wait for the next book in the series. This book continues to build tension as we wait to see what fate awaits Kappa and what will become of Siren as he decides if he will carry out his responsibility within the prophecy.

This book closes with information about what inspired each of the characters in this book from the various areas, and the characters really resemble the creatures they are inspired by. The illustrations throughout this book are gorgeous and capture your attention throughout. Each of the illustrations does a good job of captivating the emotions of the characters and creating tension as needed.

This book includes a twist that I didn't see coming, and we find out more information about the true purpose of the beacon. Read to watch this story unfold and follow along as feelings get a lot more complicated as the truth is revealed. This twist creates additional concern for all the creatures in the sea and leaves you needing to know what the beacon's role really is within the ocean and if he can get away with leaving prophecies unfulfilled.

Final Verdict: Castle Swimmer Volume 2 is the second part of a suspenseful series that leaves you waiting to see what happens next. If you are a fan of graphic novels, webcomics, are looking for a fun summer read, or enjoy reading books about sea creatures, then this is one that you should pick up.