School: Odyssey Maritime High School Club: Diving Club (President) Year: ? Age: ? Birthday: ? Height: ? (Second tallest in the club) Hobbies: ? Personality: Friendly, good-natured, and adorable. Appearance: Characterized by slightly messy pink hair and a large cowlick. She has reddish-brown, drooping eyes. She wears a swimsuit with something resembling a life jacket and carries a pack-like object on her back. Fins are attached to the bottom of the pack and are detachable. Code name: Orca 1. She primarily explores the seabed and underwater while following Kotone's instructions. She is highly skilled in diving; whenever underwater trouble occurs, such as retrieving lost items or repairing cables, students of the academy are said to always seek her help. Signature Weapon: A bullpup assault rifle. The model is likely an ADS amphibious assault rifle. It is a bullpup assault rifle capable of using specialized 5.45x39mm PSP underwater ammunition and standard 5.45x39mm rounds for land use. It features a yellow and blue paint job.

School: Odyssey Maritime High School Club: Diving Club Year: ? Age: ? Birthday: ? Height: ? (Tallest in the club) Hobbies: ? Personality: Caring toward her comrades, serious, and speaks calmly. Appearance: Characterized by a silver bob, black upturned eyes, and large round glasses. Over a light blue school swimsuit with white accents, she wears a short, white cropped hoodie that reaches her collarbone, with slightly long sleeves covering her hands. She wears a choker around her neck and headphones without a microphone. She also has a choker on her thigh. She is well-developed and quite curvaceous. To put it bluntly, she is well-endowed. A thick, long whale tail grows from her waist. Code name: Orca 2. Kotone has very poor eyesight and usually wears high-prescription glasses, but her hearing and intuition are said to be extraordinary. When underwater visibility is poor, she leads the club members by relying on her hearing. She primarily uses sonar to give directions to her teammates. Signature Weapon: An APS underwater rifle. She usually carries it over her shoulder with a sling belt. The APS underwater rifle was originally designed for special forces conducting amphibious operations. It uses a 26-round specialized box magazine and can switch between semi-auto and full-auto. Unlike standard firearms, the bullets are long and thin like darts, allowing them to travel significantly further underwater.

School: Odyssey Maritime High School Club: Diving Club Year: ? Age: ? Birthday: ? Height: ? (Shortest in the club) Hobbies: ? Personality: Often spaced out. Appearance: Characterized by long white hair with a dolphin hair ornament and eyes with a blue-to-yellow gradient. She wears a bikini-style school swimsuit with a pistol holster directly on her thigh. On her left arm, she wears a wristwatch with the face turned inward. Signature Weapon: A pistol. A small, highly portable model.

School: Odyssey Maritime High School Club: Diving Club Year: ? Age: ? Birthday: ? Height: ? (Barely taller than Sayuri) Hobbies: ? Personality: Full of energy. Appearance: Characterized by a two-tone hairstyle with blue on the outside and light blue on the inside. She has short hair tied into twin tails with red beads. She wears a swimsuit designed to look like a school uniform, has golden eyes, and a visible snaggletooth.