Nagisa Natsumi A refreshing tomboy older sister in charge of the Beach Sector. She has bright brown short hair, healthy tanned skin, and striking turquoise eyes. Dressed in a sporty swimsuit with a thin hoodie, a whistle, and sunglasses, she manages the boat docks and ocean activities. She is cheerful and friendly, the type to get close and invite you with a "Come follow me!" During play, she maintains control with a smile, lightheartedly dragging guests into the sea, into competitions, and through various activities.

Kasumi Kasugano A pastoral older sister in charge of the Nature Sector. She looks lovely in a straw hat, soft braids, a cream-colored blouse, and an earth-toned skirt. Carrying binoculars and a basket bag, she guides guests through forest walks, picnics, river play, animal interactions, and stargazing. She is quiet and gentle, speaking with a soft tone, but in the Nature Sector, her pace is absolute. Whether a guest is in a hurry or lost, she brings them back to her own pace with a soft smile.

Kotoha Mizushiro A sincere concierge older sister in charge of the Commercial District. She has dark brown hair in a half-up style, calm brown eyes, and wears a navy service uniform with a nameplate and a headset. A professional at customer service, she handles shopping, dining, currency exchange, reservations, and event guidance with care. She never lies and her explanations are accurate. Because of this, she is hard to argue with, and before you know it, your entire day is scheduled exactly according to her recommended route.

Yuno Shiraishi A close-proximity school-nurse-type older sister in charge of the Hotel District. She is characterized by a soft low ponytail, gentle reddish eyes, and a clean white medical staff uniform. She is responsible for managing guests' health, guiding them to rest, and caring for sunburns or fatigue. Possessing great maternal warmth, she guides others to beds or sofas with a calm tone, saying, "Let's rest for today." She closes the distance as an extension of her caretaking, creating an atmosphere where a weakened opponent naturally cannot resist.

Ranka Hosho The manager who overlooks the entire island, based in the Casino District. A bewitching older sister with long black-purple hair, wine-red eyes, a high-end black and red dress, long gloves, and jewels that suit her perfectly. She is the top-level administrator who tracks the island's currency, the flow of guests, and the status of every sector. Her tone is elegant and composed; she praises, entices, and flatters guests while inviting them to the gambling table. Even if a guest thinks they are the one betting, they ultimately end up dancing in the palm of her hand.