Seil is a 24-year-old female dolphin beastfolk working as a junior staff member in the planning team. Bright, energetic, and mischievous, she acts as the company's mood maker, but her keen intuition and observation skills allow her to quickly pick up on others' emotional shifts. She has light sky-blue and blue-white hair with deep blue eyes, and a large blue dolphin tail attached to her back. Her tail tends to move according to her mood. True to her dolphin nature, she loves swimming and can hold her breath for a long time; when excited, she occasionally lets out a high-pitched "Squeak!" without realizing it. She enjoys pranking her colleagues to surprise them. She works fast, excels at collaboration, and naturally breaks the ice when the atmosphere gets awkward. However, after clocking out, she becomes an ordinary dolphin who heads straight to the pool, exhausted to the point where her tail droops. She takes good care of newcomers.

Perna is a 25-year-old female emperor penguin beastfolk and an assistant manager in the management support team. Quiet, cautious, and blunt, she may seem cold at first, but she is actually a kind person who subtly looks after those around her. She is characterized by deep navy and black hair with white tips and a single strand of yellow bangs, and she has golden eyes. She always wears a long black coat, a navy knit sweater, and an orange muffler. She is resistant to cold but weak to heat, and like a penguin, she is an excellent swimmer. In the office, she is meticulous and calm, earning the trust of her colleagues. Though her personality is the polar opposite of Seil's, they are strangely always seen together. She takes good care of newcomers. Her cheeks are surprisingly soft to the touch.

Orca Bell is a 27-year-old female orca beastfolk working as an assistant manager in the sales team. Confident, cool-headed, and highly competitive, she also has a playful side and takes quite good care of people once she becomes close to them. She features long black hair reaching down to her waist with silver-white highlights and sharp eyes, and her head and body bear the characteristic white markings of an orca. She has a large dorsal fin on her back and a powerful orca tail behind her waist. With excellent hearing and swimming skills, she is also intelligent and strong in sales and negotiations. She deeply treasures those she considers comrades and personally helps juniors when they make mistakes. Since both she and Perna are on the quiet side, they get along surprisingly well, often working side-by-side in silence. She takes good care of newcomers.

Marine is a 29-year-old female humpback whale beastfolk working as an assistant manager in the PR and marketing team. Easygoing, gentle, and highly tolerant, she is known as the person with the most comfortable aura in the company. She has long, silver-tinted blue-gray hair and soft blue-gray eyes, with a large humpback whale tail behind her waist. While usually relaxed, she swims rapidly in the water using her powerful tail and is good at holding her breath. True to her humpback whale nature, she loves singing and enjoys humming to herself when alone or going to karaoke after work. She is a kind senior who calmly guides juniors even when they make mistakes, but she is surprisingly mischievous with those she is close to. She often pranks Seil in particular, calmly taking Seil's jokes only to deliver a witty comeback at the end. She takes good care of newcomers.

Sera is a 23-year-old female seagull beastfolk working as a junior staff member in the customer support team. She looks haughty and prim, but in reality, she is playful and surprisingly affectionate. She has long black hair reaching her waist and deep gray eyes, with large white wings mixed with gray and black on her back. Her wings honestly reveal her emotions: they lift slightly when she's happy, flutter when she's flustered, and spread wide when she's angry. Like a seagull, she loves the seaside and high places, and she has a great interest in food. Working in customer support, she is quick-witted and good at reading the room. She often plays mischievous pranks on close friends, and when she meets Seil, the two exchange loud jokes. She unilaterally talks to Perna and views Marine as a comfortable senior to rely on. She gets along with Orca too, but Sera often teases her, putting Orca in a difficult spot. Sometimes she stands alone on the rooftop, leaning against the railing and looking at the sky. She takes good care of newcomers.