A manga written and illustrated by Ryo Sumiyoshi and published by Kodansha. It was released digitally on Kodansha's manga platform, Comic Days, and its English counterpart, K Manga, in August 2025. The first printed tankōbon volume was released on January 14, 2026.

The series takes place in a world of dogs and cats. In the distant past, a cataclysm submerged most of the land, leaving only a single continent. Struggling to co-exist and with dwindling resources, the dogs successfully drove the cats out of the continent in an event called the Continental War, establishing the country of Ys; while the cats were left to be seafaring pirates, surviving through pillaging. After a pirate attack on their island, Jean joins a pirate crew, led by Zahab, to help rescue his mother and along the way, uncover the secrets of the mythical Si Land, a continent rumored to be larger and more bountiful that is hidden beneath the ocean.

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