When does Big Boy's Kuroge Wagyu sirloin fair start and end?

It runs from Tuesday, September 15, 2026 through early October at a planned 167 Big Boy and Victoria Station stores.

How much is the Kuroge Wagyu sirloin steak?

The 80g steak is 1,890 yen (2,079 yen with tax) and the 160g steak is 2,990 yen (3,289 yen with tax).

What grade of wagyu is used, and how is it cooked?

Domestic Kuroge Wagyu sirloin graded 4 or above, seared over direct flame at 300°C so the inside stays juicy.

Can I order wagyu sirloin and Otawara Hamburg together?

Yes. The Sirloin Cut Steak & Otawara Hamburg plate pairs 80g of sirloin with a 150g, 200g or 250g hamburg.

What comes with the steak dishes?

Every dish is served with fluffy baked potato and broccoli, picked to let the wagyu's umami and sweet fat stand out.

Big Boy Kuroge Wagyu Sirloin Steak Fair Starts Sept 15

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Key Takeaways: Big Boy and Victoria Station run the Autumn Feast Kuroge Wagyu Sirloin Steak Fair from Tuesday, September 15, 2026 through early October at a planned 167 locations. Domestic Kuroge Wagyu sirloin graded 4 or above is grilled over direct flame at 300°C, with an 80g steak at 2,079 yen including tax and combination plates that pair sirloin with the signature Otawara Hamburg.

Big Boy to Hold “Autumn Feast Kuroge Wagyu Sirloin Steak Fair” from September 15

Big Boy Japan Co., Ltd. (President: Hidekazu Konno; Head Office: Minato-ku, Tokyo), which operates the hamburg steak and steak restaurant chains Big Boy and Victoria Station, will hold the “Autumn Feast Kuroge Wagyu Sirloin Steak Fair” starting Tuesday, September 15, 2026. The company is part of the Zensho Holdings group (listed on the Tokyo Stock Exchange Prime Market; Representative: Yohei Ogawa), and this fair offers a premium lineup perfectly suited to Japan’s “appetite of autumn” season.

Domestic Kuroge Wagyu Sirloin, Grade 4 or Higher, Flame-Grilled at 300°C

The star of the fair is domestic Kuroge Wagyu (Japanese Black beef) sirloin rated meat quality grade 4 or above. Sirloin is prized for its tender texture and the refined sweetness of its fat. Big Boy grills it over direct flame at 300°C, searing the surface for aroma while keeping the inside juicy.

Each dish comes with fluffy baked potato and broccoli as sides, chosen to let the umami and sweet fat of the wagyu sirloin stand out.

Fair Menu and Prices

Sirloin Steak

For those who want to savor the Kuroge Wagyu sirloin on its own. Two sizes are available.

80g: 1,890 yen (2,079 yen incl. tax)
160g: 2,990 yen (3,289 yen incl. tax)

Sirloin Cut Steak & Otawara Hamburg

A combination plate pairing sliced sirloin steak (80g of Kuroge Wagyu sirloin) with Big Boy’s signature “Otawara Hamburg”. Three hamburg sizes are available so guests can match their appetite.

150g: 2,490 yen (2,739 yen incl. tax)
200g: 2,650 yen (2,915 yen incl. tax)
250g: 2,850 yen (3,135 yen incl. tax)

Sirloin Cut Steak Triple Grill

An indulgent trio combining 80g of Kuroge Wagyu sirloin with 100g of grilled chicken and 100g of juicy hand-kneaded hamburg. Three different meat flavors on a single plate.

2,490 yen (2,739 yen incl. tax)

Sirloin Cut Steak & Hand-Kneaded Hamburg

A simple pairing of cut sirloin and hand-kneaded hamburg, and the most accessible price point in the fair lineup.

2,330 yen (2,563 yen incl. tax)

Fair Details and Notes

Fair name: Autumn Feast Kuroge Wagyu Sirloin Steak Fair
Start date: Tuesday, September 15, 2026
Sales period: Scheduled through early October
Participating stores: Planned for 167 Big Boy and Victoria Station locations (as of September 9)
Prices differ for some items at Big Boy Dining Waseda.
Please cook the Otawara Hamburg thoroughly on the tabletop grill before eating.

Summary

Wagyu sirloin steak is usually a special-occasion item when dining out, but during this fair the 80g portion starts at just 2,079 yen including tax. With a rich variety of combination plates, the lineup answers the common wish to enjoy wagyu without giving up Big Boy’s famous Otawara Hamburg. The fair runs only through early October, so visit your nearest Big Boy or Victoria Station to enjoy this autumn feast.