The whole ranch, all yours
The whole mountain for one group — open to the public three days a week. Reservation only.
1,444m
Up on the Tsumagoi highlands
30 indoors
For gatherings (seated) — bring your own food
50 outdoors
Plenty of room for outdoor events
Tents & camping only
You sleep at the campsite, not in the building
100+ cars
Loads of parking
The ceiling is what the mountain's septic system can honestly serve. No payment raises it. One group, properly hosted, never oversold.
Charter the ranch — any day of the week. Full-venue events are our headline offering, seven days a week: offsites, retreats, filming, weddings, private celebrations. When your event is confirmed, the entire ranch closes to all other guests — your group, a host on-site, nothing else on the mountain. Mon–Thu are dedicated charter days with no general camping at all. Fri and weekends are equally yours — book 60+ days ahead and the full calendar is open, since regular camping can't reserve that far out. Fri, Sat, Sun and holiday eves, and the July–September and October (foliage) seasons, each add ¥30,000 per day or night. Charter requests accepted up to 12 months ahead. Events always take the calendar first.
Daytime use, no overnight stay
31–50 guests: ¥180,000
Tent & camping stay
31–50 guests: ¥250,000
Facilities included · AV is a 65" TV
Charter includes equipment and shared facilities (kitchen, gym, office, showers, BBQ areas). AV is a 65-inch TV with HDMI plus a small backup projector — no large whiteboards, so plan sessions around the screen or the outdoors. You can't sleep in the main building; indoor space (up to 30) is for gatherings, and overnight stays are in tents at the campsite. Ask us about filming or live streaming.
Weekend & seasonal surcharges
Fri, Sat, Sun and holiday eves: +¥30,000. July–September (summer) and October (autumn foliage): +¥30,000. Both apply per day or per night. Extending a day charter to 23:00: +¥30,000. Other extensions (early load-in / late checkout): ¥20,000 per hour, arranged in advance.
Production days & midweek
Production Day (filming or content): flat ¥150,000, crew up to 30. Midweek Basecamp (Tue–Thu, daytime): ¥45,000 per day, contracted organisations only. Production and commercial-event charters carry a 10% operations & management fee on the venue price.
Opening season
Companies and groups book the same flat bands. For the opening season there are three Founding Charters: in exchange for letting us publish the story, you get a custom sticker run and ¥20,000 in courtesies (not a discount on the rate).
Bring your own meals
No cooked meals — cook in the shared kitchen or bring food. Basic seasoning on hand; bring favourites. Alcohol not sold on-site. Minimart: ice, snacks, cup noodles, microwave meals, drinks (pay-as-you-go).
Invoice & qualified invoice
Invoice billing (請求書払い) available · Qualified invoice issuer 登録番号 T5011003021894
Tsumagoi-wari 20%
Tsumagoi-wari — thank you, always: residents of Tsumagoi Village get 20% off Open-Day camping and standard event bookings. Address verified at check-in.
A deposit of 50% of the estimated total (minimum ¥50,000) confirms your date. Until the deposit is paid, dates are held tentatively for 7 days.
The balance is invoiced and due 30 days before the event day (bank transfer or card).
One free date change (within 6 months) if requested 30+ days before the event. Changes inside 30 days are treated as a cancellation. If you cancel after a date change, cancellation fees are calculated against the original event date.
If we close the venue due to weather warnings or disasters, all amounts paid are refunded in full (consequential costs such as travel or equipment are not covered). Ordinary rain is not a cancellation event.
Wi-Fi reaches the field and the building. Join a call from the tent or a camp chair.
Amps, karaoke, live sets, fire-circle talks past midnight — no neighbors for 7 km means nobody to disturb. (Open Days keep quiet hours 22:00–08:00.)
Toy fireworks (がん具煙火) need no permit and most campgrounds ban them anyway — we don't. Handheld and fountain types only (no launched/rocket types), designated gravel area, bucket of water, embers to the ash cans.
Bring your own tent sauna, stove, and cold-plunge tub — a field, water access, and fire rules are the whole product. We never provide or operate a sauna (that would need a Public Bath House Act permit).
No light sources for 7 km at 1,444 m — the Milky Way is naked-eye visible on clear nights. Schedule around new moons; Perseids (mid-August) and Geminids (mid-December) are the flagship star-party windows.
Outside any DID (populated-area) zone — filming crews and drone schools hunt for legal practice fields like this. Pilot is responsible for Aviation Act compliance (registration, Remote ID, line-of-sight, under 150 m; night flight needs separate approval).
All camp sites are pet-friendly — well-behaved dogs welcome, leash in shared areas.
Bring-Your-Own-Sauna field day: tent-sauna owners show off their rigs, the mountain provides water, space, and fire rules. The community is large, online, and starved for legal venues.
Water access + open field
Jimny convoys, rooftop-tent and overlanding crews, camper vans, touring riders — the host drives a JB74 himself. Convoy in (4WD only, at your own risk), camp on the field, no closing time.
100+ parking
Telescope clubs and astro-photo communities schedule around new moons — hand them a dark sky with indoor warm-up space. Geminids in mid-December give the quiet season a marquee night.
Zero light pollution
Rehearsal space in Tokyo is expensive and time-boxed. Here a group gets a carpeted indoor hall plus outdoor volume freedom for a whole weekend — midweek charters fit school and amateur ensembles perfectly.
Carpeted indoor hall
Fiber at 1,444 m, a table for every laptop, and total isolation — a hackathon venue that sounds made up. Esports bootcamps belong here too.
Fiber + 20+ tables
Open fields, mountain backdrops, a dark sky after sunset, and indoor changing space — photography communities book venues by the day.
Fields + indoor space
A booming corporate-events genre: open field for the games, indoor hall as rain backup, convoy-scale parking. Exactly the spec event buyers search for.
Field + rain backup + parking
Running a community that needs a venue? Same charter rates, one contact, no quiet hours — tell us your format.
Your logo × Tsumagoi 1,444 m co-branded die-cut stickers, designed and printed by us. Standard Kit: FREE with every charter — one co-branded sticker for each guest, on us. Summit Kit: ¥800–1,000/head — custom event artwork with every sticker sequentially numbered (001, 002, …) for badges, raffles, or limited runs. Lead time from artwork approval: 14 days up to 1,000 pcs handed over on-site at your event; shipped orders 21 days up to 1,000 pcs, 28 days above 1,000.
The price card is public — every number below is the real price. Rush +30%. Prices exclude consumption tax (消費税別). S/M/L are print-and-ship — no event required, 100-piece minimum; the per-head kits above are a charter add-on (artwork coordination, on-site handout, one qualified invoice line). Option: 5-sticker gift sheets for 200 guests (2 sheet layouts, 5-up half-cut) — a gift pack for handouts, not a cheaper Tier L.
One per-head price, one qualified invoice (適格請求書): venue + tent & gear rental + firewood + gear shipping + coordination. Priced at a visible premium over a-la-carte (+15–20%) — the premium is the single-vendor convenience. Bedding is never included in any bundle.
Ship your equipment, AV kit, and team-building props ahead — we receive, rack, and hand over on event day. Free for full-venue charters (¥500/parcel on Open Day stays).
Rain on event day? Leave the wet tents with their storage bags and we air-dry them in the yard — ¥3,000 per tent, charter bookings only, tent count agreed in advance. You arrange the Yamato return pickup at the venue and sign a damage waiver (免責): we dry, you ship.
Book your charter around a new moon and end day one under the Milky Way — we'll flag meteor-shower windows (Perseids, Geminids) when you pick dates.
A pattern our corporate groups ask for: charter the mountain for the day — sessions in the hall, breakouts on the field, fire circle at dusk — then drive down to a hot-spring hotel for dinner, baths and beds. Manza Onsen is about 10 minutes up the Manza Highway (allow ~15 in snow); Kusatsu Onsen is roughly 50–60 minutes via Mihara (the year-round route). We are happy to coordinate timing with the hotel on your booking.
~10–15 min via the Manza Highway (15 in snow)
~50–60 min via Mihara (year-round route, estimate)
Drive times: Manza ~10 min per the Tsumagoi tourism association, ~15 min when the road is snow-covered; Kusatsu 50–60 min is an estimate via the year-round Mihara route. The direct R292 route past Manza is seasonal and can close at short notice on volcanic-alert changes — plan Kusatsu transfers via Mihara. The Manza Highway is a toll road (cash only, no ETC).
Teams of up to 8 book a regular camping stay on Open Days (Fri, Sat, Sun) — fiber office and full facilities included. Mon–Thu are charter-only. Want the whole ranch? Charters are a flat rate by guest band: from ¥120,000 day / ¥180,000 overnight up to 30 guests (¥180,000 / ¥250,000 for 31–50; 50 is the cap).
Arrive — parking for the whole convoy
Morning session in the indoor lounge
50+ seats across 20+ tables, fiber Wi-Fi — hybrid attendees dial in without drama.
BBQ lunch on the field
Outdoor breakouts — benches, open field, mountain backdrop
Free block: field games or a walk to the Aisai bell
Fire circle — or stay the night in tents and keep talking
Indoor gatherings suit up to 30; outdoor events up to 50. Total headcount is capped at 50 across both zones.
Charters run any day of the week. Prices are on this page. Leave your email or use the button below once you have dates and a headcount. No walk-ups.
Take over the whole ranch at 1,444m. Indoor space holds up to 30 for meals and gatherings; outdoor events up to 50; combined cap 50. You stay in tents (the main building isn't for sleeping). One group at a time. Open to the public three days a week; every other day the mountain belongs to whoever booked it. Reservation only — no walk-ups.
