Nearly 100x Applicants for World Heritage Stay: Unlocking Regional Resources and New Resort Markets through Infrastructure Solutions.

INNFRA Inc. (Headquarters: Kofu, Yamanashi; CEO: Soshi Kawashima), in collaboration with Nakagusuku Village, Okinawa, conducted a pop-up resort pilot project using autonomous water circulation technology, primarily on weekends from December 2025 to January 2026.

In this pilot, a temporary accommodation space—combining campers, decks, heated pools, showers, water circulation systems, and power equipment—was installed in a World Heritage area where large-scale development or utility connections are difficult. Four groups selected from public applications spent a night at the Nakagusuku Castle Ruins after operating hours.

This project was realized after INNFRA's "Phase-Free Okinawa Model" won the Excellence Award in the public-private co-creation program "Social X Acceleration for OKINAWA."

The background lies in Nakagusuku Village's desire to "create new tourism and stay value utilizing cultural assets amid challenges like a shortage of accommodations and declining visitor numbers," and INNFRA's vision to "realize comfortable environments for people to stay even in locations where infrastructure installation is difficult, using off-grid equipment."

The results demonstrate the potential to develop regional resources with infrastructure constraints into new hubs that bridge tourism, experience, and disaster prevention.

For the free trial monitor recruitment, 387 groups (equivalent to approximately 1,157 people) applied for the 4 available slots, nearly 100 times the capacity, showing high interest from the start.

Applicants were primarily from within Okinawa, with many families looking to spend special time together. However, about one-quarter of applications came from outside the prefecture, indicating strong interest from travelers and Tokyo residents as well.

In the post-stay survey, all participants responded that they were "very satisfied." Particularly highly rated were the scenery, sense of openness, the uniqueness of the World Heritage site, and the sense of privacy. Regarding water facilities, 80% of guests responded that they were "comfortable" or "did not feel significant inconvenience."

Regarding the appropriate price range for the final version (per person), no participants answered 10,000–20,000 yen; everyone answered 30,000 yen or more. 60% of respondents accepted a price range of 50,000 yen or higher.

Based on the insights gained at Nakagusuku Castle, INNFRA will continue to expand new stay and experience hubs that utilize regional resources where infrastructure development is difficult.