This page is an unofficial, independent experience-design proposal inspired by Pension Sainantan (Hateruma Island). The facility facts — all rooms ocean-view, all rooms non-smoking, every plan one night with two meals, port pickup, the Southern Cross from the rooftop terrace, check-in 14:00 / check-out 10:00, and telephone-only booking — were confirmed on the official site (pensionsainantan.wixsite.com) on 2026-07-19. Rates and availability, however, change. The total room count is not stated on the official site, and the room figures even differ between official pages, so we do not assert a room count. Amenity details (Wi-Fi, bathing, etc.) are unconfirmed — always confirm bookings and the latest details on the official site or by telephone. Island-level facts (Nishihama, the ferry route, the observation tower’s closure) rest on sources verified within this repository. The chaptered narrative is an editorial concept proposal.