After her husband dies, widow Tova Sullivan starts working at the Sowell Bay Aquarium, where she forms a special bond with a giant Pacific octopus who holds the key to solving the mysterious disappearance of her 18-year-old son, Erik, over thirty years ago on the Puget Sound.

Bookish high school student Rintaro Natsuki is about to close the secondhand bookstore he has inherited from his beloved bookworm grandfather. However, one day, a talking cat named Tiger appears and asks Rintaro to save books with him. Of course, "ask" is putting it politely -- Tiger is demanding Rintaro's help. The world is full of lonely books, left unread and unloved, and only Tiger and Rintaro can liberate them from their neglectful owners. And...

The best time of the year has arrived-- Mermicorn Island's annual costume contest. Lucky loves designing ever more elaborate costumes for his Fintastic Four, in the hopes of finally taking home the grand prize. But when a fierce-looking shark crashes the ball, everyone swims for cover.