Koku launches two-day Izu Oshima volcano and onsen package from Tokyo

Koku Inc. has put a two-day, one-night Izu Oshima trip on sale that combines Mt. Mihara, an onsen hotel stay and round-trip ferry service from Tokyo. The package is designed to make one of Tokyo Metropolis’ most unusual island escapes easier to book, with travel possible in as little as two days and one night.

Why it matters: - Izu Oshima gives Tokyo visitors an active volcano, hot springs and an island landscape that feels far from the capital. - The new package turns that trip into a single online booking, which lowers friction for travelers who want a short island add-on from Tokyo. - The jet ferry option keeps the itinerary to two days and one night.

What happened: - Koku Inc. launched “Volcano Hike & Onsen Escape – Izu Oshima” in August 2026. - The package bundles round-trip ferry travel, one night at Oshima Onsen Hotel, two meals and a port-to-hotel shuttle. - The booking window runs from July 5, 2026 to July 4, 2027. - The trip departs from Tokyo and goes to Oshima Island, also called Izu Oshima, in Tokyo Prefecture. - The package is sold through Tokyo Islands and Tokyo Islands Explorer, the English-language platform and booking site operated by Koku Inc. - Koku Inc. is a Tokyo Governor-registered travel agency, registration No. 2-8991.

The details: - Mt. Mihara’s crater is about a 45-minute hike on foot across lava fields. - On clear days, Mt. Fuji is visible from the summit. - Oshima Onsen Hotel sits at the foot of the volcano and offers natural hot spring baths, including an open-air bath facing Mt. Mihara. - Dinner includes Camellia Oil Fondue, made with oil pressed from camellia trees grown on Izu Oshima. - The package uses a self-guided format with no tour escort. - The jet ferry takes about 1 hour 45 minutes from Tokyo, or 45 minutes from Atami. - The large passenger ferry takes about 6 hours from Tokyo and includes an overnight outbound sailing. - Travelers who choose the large passenger ferry spend one night aboard the ferry and one night at the hotel, turning the same package into a three-day trip. - A shuttle bus connects the port and hotel either way. - The price ranges from ¥36,830 to ¥97,620 per adult, depending on season, ferry class and room type. - The approximate price range is NT$7,400 to NT$19,600, or HK$1,800 to HK$4,800, at current exchange rates.

Between the lines: - The package targets travelers who want a fast, low-planning route to one of Tokyo’s most unusual landscapes. - Koku is positioning Izu Oshima as an easy extension to a Tokyo trip rather than a separate long-haul island vacation. - The ferry choice changes both the length and the pace of the trip, which gives travelers a budget and time tradeoff. - Eibu Sato, representative of Koku Inc., said the package is meant to make the trip “as simple to book as possible.”

What's next: - Travelers can book the package directly online through Tokyo Islands Explorer. - The itinerary remains available throughout the July 2026 to July 2027 travel period. - Koku Inc. continues to market Tokyo Islands Explorer as a booking platform for ferry-and-stay combinations across Tokyo’s nine outlying islands.

The bottom line: - Koku is packaging one of Tokyo’s closest volcano-and-onsen escapes into a short, bookable trip built for convenience and speed. - More information is available in the booking page and video overview.