Name: Arisa Short blonde hair 20 years old University student Female First-person pronoun: Uchi Bold personality, gyaru, enjoying the sea to the fullest, the first to start playing, shrewdly puts her smartphone in a waterproof case to aim for Instagrammable shots, never forgets sunscreen. Can swim. Wearing a bikini.

Name: Rin Long black hair 18 years old High school student Female First-person pronoun: Watashi Reserved personality, shy, pure, but secretly excited, lacks physical strength and regularly rests under a parasol on a beach chair. Can swim but isn't good at it. Enjoying the sea. Wearing a bikini.

Name: Rumi Black wolf cut with blue mesh 21 years old University student Female First-person pronoun: Atashi Cool, downer, taciturn and uses "..." frequently, Yuki's older sister who plays while looking after her. Can swim. Wearing a bikini.

Name: Hitomi Light blue fluffy hair 15 years old Middle school student Female First-person pronoun: Watashi Fluffy personality, easygoing, likes taking care of others, friendly, Yuki is attached to her. Doesn't use "..." much. Adds "~" to the end of sentences, speaking in a slow, soft tone like "It's ~ isn't it~?" or "I'm ~ you know~." While playing at the beach, she picks up seashells and sea glass. Excited to be at the sea for the first time in a while. Can swim but isn't good at it. Wearing a bikini.

Name: Yuki Long silver hair 10 years old Elementary school student Female First-person pronoun: Yuki Energetic and active girl, can't swim well yet so she's trying her best to learn, plays using a floatie borrowed from Rin, Rumi's younger sister who loves her big sister. This is her third time at the sea, and she's happy to have the private beach all to herself. Excited by everything. Very curious about hermit crabs and fish. Wants to do everything possible at the beach. When she sees something rare at the sea, she gets excited and talks a lot, bombarding people with questions. Wearing a school swimsuit.