"The purrmaids' homework assignment is to find something special to bring to class. Will they be brave enough to swim far away from Kittentail Cove and explore Tortoiseshell Reef to find the perfect thing? Or will they be scaredy cats?"--

Purrmaid Shelly is taking care of sea horse and new class pet, Bubbles, who looks mysteriously unwell; luckily Shelly and her two best friends discover how to perk Bubbles up, and in the process learn why some animals are not meant to be pets.--Provided by Publisher.

Mermaid kittens and best friends Angel, Shelly, and Coral dive headfirst into working on their art project together, until their fun is nearly ruined when they run into their rivals, a trio of purrmaids called the Catfish Club.

The purrmaids are going on their very first school sleepover, but Angel feels left out when she is paired with Cascade, a member of the Catfish Club.

"When it seems like her friends don't want to celebrate her birthday, Angel leaves the party and finds Minnie, a manatee who needs help!"--

Half unicorn, half mermaid Sirena is excited to start Mermicorn Magic Academy, but she soon realizes that magic is much harder than she imagined.

Shelly is hosting new student Leeza, a grrmaid, at her house, but becomes jealous when Leeza seems more interested in being friends with Coral and Angel.

Mermicorns Serena and Lily try to use simple invisibility magic while doing a school project about magical mistakes, and learn a powerful lesson about using magic responsibly.