Inheritance of an Established Fishmonger's Legacy. "Uo to Sake Beck" Opens in Ikebukuro on May 15th
Mostfun Inc. is opening a new restaurant concept, "Uo to Sake Beck Ikebukuro West Exit," on May 15, 2026, in Ikebukuro. It inherits the discerning eye and spirit of Uohatsu, a long-established fishmonger in Kichijoji, offering fresh fish directly from Toyosu Market and carefully selected sake.
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- 📰 Published: May 9, 2026 at 20:49
- 🔍 Collected: May 9, 2026 at 12:02
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Mostfun Inc. (Headquarters: Yokohama City, Kanagawa Prefecture; Representative Director: Takumi Osaki), whose philosophy is to achieve the world's best employee satisfaction in Japan, will grand open a new business format, "Uo to Sake Beck Ikebukuro West Exit," on Friday, May 15, 2026, on the street level, a 2-minute walk from Ikebukuro Station West Exit.
This restaurant is a fish tavern that inherits the discerning eye and spirit of "Uohatsu," a long-established fishmonger loved in Kichijoji for approximately 100 years. Centered around the famous "Yondaime Okemori" (Fourth-Generation Tub Platter), which offers the freshest fish of the day in thick slices unique to a fishmonger, the restaurant provides dishes that maximize the umami of the ingredients and carefully selected Japanese sake. There are also mezzanine seats where you can relax without shoes, creating a space where you can enjoy delicious fish and sake without pretense.
■ Inheriting 100 Years of Fishmonger Expertise, Now in Ikebukuro
"Uohatsu," a long-established fishmonger founded in Kichijoji approximately 100 years ago, transformed into "Musashisakai Osakanaya-san" in 2020 and has continued to be loved by the community. Even after "Musashisakai Osakanaya-san" joined Mostfun in 2024, its reliable discerning eye and the belief of "delighting the customers in front of us" are still cherished and continue to evolve.
At this restaurant, the owner of "Musashisakai Osakanaya-san" visits Toyosu Market every morning to personally procure the best fresh fish of the day. Furthermore, the expertly selected fish are delivered directly to the restaurant, where the chefs transform them into uncompromising dishes for the customers.
■ A Fishmonger's True Spirit: "Yondaime Okemori" and Carefully Selected Condiments
From "Uohatsu," founded approximately 100 years ago, to "Musashisakai Osakanaya-san," and now to "Uo to Sake Beck." The history and spirit of generations of fishmongers are embodied in the name "Yondaime Okemori" (Fourth-Generation Tub Platter).
With the concept of "a fishmonger's true spirit is conveyed through thickness," the freshest and most delicious fish of the day are served in generous, thick slices. This is a tub platter unique to a fishmonger, committed to the satisfaction of each single slice.
Yondaime Okemori: 1,980 yen (tax included) *Photo shows 4 servings
We offer two types of original "Hyakunen Shoyu" (Hundred-Year Soy Sauce) developed to complement sashimi: a sharp, dry dashi-soy sauce and a rich, sweet tamari-soy sauce. Furthermore, we are particular about each ingredient, such as "Namara Salt" from Hokkaido and freshly harvested vegetables delivered daily from Chiba Prefecture.
■ Signature Dishes
The Correct Potato Salad 780 yen (tax included)
Beck's potato salad, mixed with a soft-boiled egg. The rich egg and special sour cream enhance the sweetness of the potatoes.
Whole Onion Oden 680 yen (tax included)
Awaji Island onions are slowly simmered whole, thoroughly absorbing the umami of the broth. This is our proud oden that melts in your mouth.
■ A Drink to Match Your Mood Today
Beck offers "Kyo no Kibunshu" (Today's Mood Sake), where you can choose Japanese sake based on your mood. By choosing based on your "current mood" rather than "taste differences," you can enjoy Japanese sake more freely and casually.
For example, we offer 16 types of mood sake to choose from, such as for "people who want to turn an ordinary day into a slightly better one" or "people who came today to eat genuinely delicious fish."
■ Mezzanine Space Design that Deepens Conversation
The interior of the restaurant features a unique three-story structure with a mezzanine floor. In the mezzanine, where you take off your shoes and ascend, you can relax as if you've returned home, naturally leading to deeper conversations. It's like a secret base where you can spend a relaxed, unpretentious time.
■ Store Information
Store Name: Uo to Sake Beck Ikebukuro West Exit
Location: 1-33-7 Nishi-Ikebukuro, Toshima-ku, Tokyo (2-minute walk from Ikebukuro Station West Exit (North) / immediately from Exit 20a)
Seating Capacity: 48 seats (1F 16 seats, mezzanine 16 seats, 2F 16 seats)
Business Hours: Weekdays 15:00-23:00 / Weekends & Holidays 12:00-23:00
Instagram: https://www.instagram.com/beck_ikebukuro/
■ Company Overview
Company Name: Mostfun Inc.
Representative Director: Takumi Osaki
Location: 1-11-4 Shin-Yokohama, Kohoku-ku, Yokohama City, Kanagawa Prefecture
Business Activities:
・Restaurant management
・HR recruitment support
・System development
・Welfare services, etc.
URL: https://mostfun.jp/
This restaurant is a fish tavern that inherits the discerning eye and spirit of "Uohatsu," a long-established fishmonger loved in Kichijoji for approximately 100 years. Centered around the famous "Yondaime Okemori" (Fourth-Generation Tub Platter), which offers the freshest fish of the day in thick slices unique to a fishmonger, the restaurant provides dishes that maximize the umami of the ingredients and carefully selected Japanese sake. There are also mezzanine seats where you can relax without shoes, creating a space where you can enjoy delicious fish and sake without pretense.
■ Inheriting 100 Years of Fishmonger Expertise, Now in Ikebukuro
"Uohatsu," a long-established fishmonger founded in Kichijoji approximately 100 years ago, transformed into "Musashisakai Osakanaya-san" in 2020 and has continued to be loved by the community. Even after "Musashisakai Osakanaya-san" joined Mostfun in 2024, its reliable discerning eye and the belief of "delighting the customers in front of us" are still cherished and continue to evolve.
At this restaurant, the owner of "Musashisakai Osakanaya-san" visits Toyosu Market every morning to personally procure the best fresh fish of the day. Furthermore, the expertly selected fish are delivered directly to the restaurant, where the chefs transform them into uncompromising dishes for the customers.
■ A Fishmonger's True Spirit: "Yondaime Okemori" and Carefully Selected Condiments
From "Uohatsu," founded approximately 100 years ago, to "Musashisakai Osakanaya-san," and now to "Uo to Sake Beck." The history and spirit of generations of fishmongers are embodied in the name "Yondaime Okemori" (Fourth-Generation Tub Platter).
With the concept of "a fishmonger's true spirit is conveyed through thickness," the freshest and most delicious fish of the day are served in generous, thick slices. This is a tub platter unique to a fishmonger, committed to the satisfaction of each single slice.
Yondaime Okemori: 1,980 yen (tax included) *Photo shows 4 servings
We offer two types of original "Hyakunen Shoyu" (Hundred-Year Soy Sauce) developed to complement sashimi: a sharp, dry dashi-soy sauce and a rich, sweet tamari-soy sauce. Furthermore, we are particular about each ingredient, such as "Namara Salt" from Hokkaido and freshly harvested vegetables delivered daily from Chiba Prefecture.
■ Signature Dishes
The Correct Potato Salad 780 yen (tax included)
Beck's potato salad, mixed with a soft-boiled egg. The rich egg and special sour cream enhance the sweetness of the potatoes.
Whole Onion Oden 680 yen (tax included)
Awaji Island onions are slowly simmered whole, thoroughly absorbing the umami of the broth. This is our proud oden that melts in your mouth.
■ A Drink to Match Your Mood Today
Beck offers "Kyo no Kibunshu" (Today's Mood Sake), where you can choose Japanese sake based on your mood. By choosing based on your "current mood" rather than "taste differences," you can enjoy Japanese sake more freely and casually.
For example, we offer 16 types of mood sake to choose from, such as for "people who want to turn an ordinary day into a slightly better one" or "people who came today to eat genuinely delicious fish."
■ Mezzanine Space Design that Deepens Conversation
The interior of the restaurant features a unique three-story structure with a mezzanine floor. In the mezzanine, where you take off your shoes and ascend, you can relax as if you've returned home, naturally leading to deeper conversations. It's like a secret base where you can spend a relaxed, unpretentious time.
■ Store Information
Store Name: Uo to Sake Beck Ikebukuro West Exit
Location: 1-33-7 Nishi-Ikebukuro, Toshima-ku, Tokyo (2-minute walk from Ikebukuro Station West Exit (North) / immediately from Exit 20a)
Seating Capacity: 48 seats (1F 16 seats, mezzanine 16 seats, 2F 16 seats)
Business Hours: Weekdays 15:00-23:00 / Weekends & Holidays 12:00-23:00
Instagram: https://www.instagram.com/beck_ikebukuro/
■ Company Overview
Company Name: Mostfun Inc.
Representative Director: Takumi Osaki
Location: 1-11-4 Shin-Yokohama, Kohoku-ku, Yokohama City, Kanagawa Prefecture
Business Activities:
・Restaurant management
・HR recruitment support
・System development
・Welfare services, etc.
URL: https://mostfun.jp/