Koshu Beef Steakhouse Ishii is a teppan-grill restaurant in central Kofu specializing in Koshu beef, the branded wagyu raised within Yamanashi Prefecture, grilled tableside on an iron griddle in the style typical of Japanese steakhouses. The dinner menu centers on a Koshu beef sirloin steak cooked to order and a wine-paired tasting course that steps through several cuts alongside glasses of Koshu wine from Katsunuma, tying together two of the prefecture's signature products in a single meal. A more affordable Koshu beef hamburg steak lunch set makes the restaurant accessible for a midday visit without the full steakhouse price tag. The dining room is arranged around individual teppan grill counters, giving diners a close view of the chef's technique as each course is prepared, with a formal but not overly stiff atmosphere suited to a special dinner rather than a casual drop-in. Reservations are recommended, especially for dinner, since counter seating is limited. Prices vary widely depending on the cut and course, from about ¥4,500 for the lunch set to ¥13,000 for the full wine-paired tasting course. The restaurant is closed on Wednesdays.
Signature dishes
- Koshu beef sirloin steak
- Koshu beef hamburg steak lunch set
- Wine-paired beef tasting course
Good to know
- Known for
- Teppan-grilled Koshu beef, Yamanashi's own branded wagyu, cooked tableside with Koshu wine pairings
- Hours
- 11:30–14:00, 17:30–21:30; closed Wednesdays
- Reservations
- Recommended, especially for dinner
Location
1-5-3 Chuo, Kofu, Yamanashi 400-0031
35.6619, 138.5695 View on map
Highlights
- Koshu beef, Yamanashi's own branded wagyu, grilled tableside on teppan
- Wine-paired tasting course combining Koshu beef and Katsunuma wine
- More affordable hamburg steak lunch set available at midday
- Individual teppan grill counters for a close view of the chef's technique
Tips for visiting
- Reserve ahead for dinner, since teppan counter seating is limited
- Try the lunch hamburg steak set for a more affordable taste of Koshu beef
- Order the wine-paired tasting course to sample both Koshu beef and Katsunuma wine together
- Closed on Wednesdays
Accessibility
The restaurant has standard counter and table seating with level, modern flooring generally accessible to visitors with mobility needs.
Frequently asked questions
What is Koshu beef?
It is a branded wagyu beef raised within Yamanashi Prefecture, served here as teppan-grilled steak and in a wine-paired tasting course.
Is there a more affordable option than the dinner course?
Yes, a Koshu beef hamburg steak lunch set offers a lower-cost way to try the beef at midday.
Should visitors reserve ahead?
Yes, reservations are recommended, particularly for dinner, given limited teppan counter seating.
What are the hours?
Lunch runs 11:30am–2pm and dinner 5:30pm–9:30pm, closed on Wednesdays.