光泉寺 Kosenji Temple

Updated June 11, 2025

## Kōsenji Temple (光泉寺), Kusatsu Onsen — A Practical Guide with History, What to See, and How to Visit

Kōsenji Temple sits directly above Yubatake, the famous hot-water field at the center of Kusatsu Onsen in Gunma Prefecture. A short staircase from Yubatake brings you to a quiet precinct with views over the steaming pools and the town below. The temple grounds are free to enter and are one of the easiest spots to combine with an onsen stroll.

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### Why Kōsenji matters in Kusatsu

– Hilltop vantage over Yubatake: The temple overlooks the hot-water cooling pools that feed many baths in town, making it a reliable photo stop for sunrise, late afternoon, or a night-view after the lamps come on around Yubatake. The climb is brief but steep.
– Onsen-linked faith site: Kōsenji is closely tied to Kusatsu’s hot spring culture. A monument on the grounds commemorates Kobayashi Issa (1763–1828), the Edo-period haiku poet who visited Kusatsu multiple times and wrote verse inspired by the steam.
– New five-story pagoda (2023): A striking vermilion, five-storied pagoda was completed in November 2023 (approx. 21.4 m tall) with a titanium roof—now a prominent skyline marker above Yubatake.

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## Brief history (what’s well-documented)

– Origins of the Yakushi Hall (8th century tradition): A long-standing temple tradition says the Yakushi Hall (dedicated to Yakushi Nyorai, the Medicine Buddha) dates to 721, when the monk Gyōki prayed for the sick and hot springs gushed forth here. This is a legend recorded locally and repeated in major travel references.
– Temple (re)establishment in 1200: The temple proper is said to have been rebuilt in 1200 (Shōji 2) as the betto-ji (temple administering a shrine) of Shirane Myōjin, under the local Yumoto clan. This is noted by the temple’s own information page.
– Later status and ties: Sources indicate Kōsenji later held status as an imperial temple in the late 15th century (associated with the court noble Konoe Dōkō). While not a core detail for a short visit, it shows the site’s historical significance in the region. Japan Guide
– Sect affiliation today: Kōsenji is a Shingon Buddhism (Buzan school) temple; the principal image is Yakushi Nyorai.

> Note on “Japan’s three great onsen Yakushi”: Some Japanese sources list Kōsenji among the “Nihon Sandai Onsen Yakushi.” The makeup of the “three” varies by source (Arima Onsen’s Onsenji and Yamanaka/山中 or similar are commonly mentioned). Treat this label as a traditional honorific rather than an official designation. Japan（ファウンド・ジャパン） – ぶらり散歩で身近な日本史

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## What to see on the grounds

– Main approach & gate: The stone staircase from Yubatake leads to the temple’s gate and precincts. Allow a few minutes for the climb—stones can be slick in rain or snow.
– Yakushi faith sites: Beyond the main hall, you’ll find small halls and images linked to Yakushi devotion (the “Medicine Buddha” traditionally invoked for healing).
– Haiku monuments: Look for the stone monument to Kobayashi Issa (the board nearby often cites one of his Kusatsu verses).
– Five-story pagoda (2023): The newest landmark. Its color and proportions photograph well with seasonal foliage or snow. Respect any posted guidance; interior access is generally not part of routine visits.
– Views back to Yubatake: From the precinct, you can frame Yubatake and the town—handy for orientation before you explore side streets and bathhouses.

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## Practical visiting info

Location & address:
446 Kusatsu, Agatsuma District, Gunma 377-1711, Japan (a minute or two uphill from Yubatake).

Hours & fees:
– Grounds: open access (outdoor precinct).
– Buildings/office: commonly daytime hours around 9:00–17:00 are referenced by travel guides; these can change with seasons and events—verify on the day.

Accessibility:
– Expect steep stone steps; there’s no reliable, step-free route from Yubatake for wheelchairs or strollers noted in official visitor pages. Plan assistance if needed. (This is based on the site’s hilltop layout as described by regional tourism sources.)

Etiquette reminders:
– Hats off in halls; no flash where prohibited; keep voices low—Kōsenji is an active religious site. (Standard temple etiquette; check on-site signs.)

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## Getting there (fastest, least confusion)

By train + bus (most common):
– Take the JR Limited Express Kusatsu/Agatsuma Line from Ueno/Tokyo area to Naganohara-Kusatsuguchi Station (2–2.5 hrs depending on service).
– Transfer to JR Bus Kantō to Kusatsu Onsen Bus Terminal (25 minutes; frequent connections aligned with trains). From the terminal, it’s ~5 minutes on foot to Yubatake, then a short climb to the temple.

Direct highway bus from Tokyo:
– Buses run from major terminals (e.g., Shinjuku) to Kusatsu Onsen in about four hours; this is a single-seat option if you prefer to avoid rail transfers.

From Karuizawa (Hokuriku Shinkansen link):
– There are direct buses Karuizawa → Kusatsu Onsen (~1 hr 20 min). Useful if you’re combining Nagano-side sightseeing.

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## When to go & photography notes

– Autumn (kōyō) & winter: The precinct pairs well with autumn foliage and snow scenes, especially with steam rising from Yubatake below. The temple’s new vermilion pagoda makes seasonal color pops even stronger.
– Early morning / evening: For crowd-free frames over Yubatake, aim for early light; for night shots, capture the lit walkways around the hot-water field and shoot back toward the temple silhouette. (Yubatake is noted as a 5-minute walk from the bus terminal, so it’s easy to check lighting and return.) Guide
– Footwear: In winter, steps can ice over; traction helps.

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## Nearby pairing ideas (short list)

– Yubatake circuit: Walk the boardwalks around the hot-water field, then return to Kōsenji for a quick overlook. Guide
– Sai-no-Kawara Park: A well-known geothermal park/walking area west of the center; about 10 minutes from Yubatake by foot per local visitor guidance. (Good to combine if you’re doing everything on foot.) Travel

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## Quick fact sheet

– Name: Kōsenji Temple (光泉寺)
– Where: Above Yubatake, Kusatsu Onsen, Gunma
– Founded (tradition): 721 for the Yakushi Hall (Gyōki legend); 1200 for the temple’s rebuild as a shrine-administering temple (betto-ji).
– Sect / principal image: Shingon (Buzan school) / Yakushi Nyorai.
– Signature features: Hilltop views of Yubatake; Issa haiku monument; five-storied pagoda (completed Nov 2023, ~21.4 m, titanium roof).
– Address: 446 Kusatsu, Agatsuma-gun, Gunma 377-1711.
– Typical daytime hours cited: 09:00–17:00 (check locally; hours may change).

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## Important accuracy notes (read before you publish)

– Hours & access can change. Third-party sites list daytime hours for offices/indoor spaces; temple grounds are outdoors and commonly open to walk-through, but confirm onsite if you’re planning interior visits or special prayers.
– “Three great onsen Yakushi” label varies by source. It’s a traditional designation with non-uniform membership across references; avoid stating a single canonical trio without context. Japan（ファウンド・ジャパン） – ぶらり散歩で身近な日本史
– New pagoda details. Height (21.4 m) and Nov 2023 completion are documented across multiple local posts and videos; if you reference ceremonies or interior access, verify current policy on the day.

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### Bottom line

If you’re in Kusatsu Onsen—even for a day trip—Kōsenji is a low-effort, high-context stop: quick stairs from Yubatake, historical depth tied to hot-spring healing rites, and a 2023 five-story pagoda that now anchors many of the best town-view photos. Combine it with a Yubatake loop and a soak, and you’ve covered the essentials with substance.

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Sources used for verification include Gunma’s official tourist guide, the temple’s own info pages, Japan-focused travel guides, and recent local reports documenting the 2023 pagoda completion and on-the-ground access details.

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