story:

Episode 13: The Sunken Sea

Shinpei and his friends travel to the bottom of the sea to find the source of the Shadows.

They encounter a group of Shadows who are guarding the source, and they must fight them in order to proceed.

Shinpei learns that the source of the Shadows is a mysterious creature called the "Shadow King."

Points:

Shinpei and his friends travel to the bottom of the sea, which is a dangerous and challenging journey.

They encounter a group of Shadows who are guarding the source, which is a formidable obstacle.

Shinpei learns that the source of the Shadows is a mysterious creature called the "Shadow King."