The Secret Treasure of Summer Beach

Create a storybook for 3-6 year olds about two sisters, a cheerful 6-year-old named Hikari and her shy 4-year-old sister Shio. On their first trip to the beach, Shio loses her precious shell necklace. To comfort her sister, Hikari leads a search and they meet helpful animal friends: a knowledgeable Mr. Hermit Crab, playful dolphin messengers, and a kind Grandpa Anglerfish who lights up the deep. With their help, they find the necklace. The style should be a fresh and bright Japanese anime aesthetic, with a warm, healing, and fantastical atmosphere. The story should emphasize themes of sisterly love, courage, optimism, and the harmony between humans and nature.