MOS Food Services, Inc. (President and Representative Director: Eisuke Nakamura; headquarters: Shinagawa, Tokyo), the operator of MOS Burger, announced on October 30, 2026 that it will hold “Lucky Mos Festa ~Autumn Customer Appreciation Festival~” at all MOS Burger stores in Chiba and Ibaraki Prefectures. The event commemorates Ibaraki Prefecture Day on Friday, November 13. It features two special limited-edition items, the Zeitaku Mos Burger (¥810) and the Zeitaku Mos Cheeseburger (¥890), available for three days only, from Friday, November 13 to Sunday, November 15. (“Zeitaku” means “luxurious” in Japanese.)
Lucky Mos Festa: Event Overview
- Event name: Lucky Mos Festa ~Autumn Customer Appreciation Festival~
- Sales period: Friday, November 13 to Sunday, November 15, 2026 (3 days only)
- Participating stores: All MOS Burger stores in Chiba and Ibaraki Prefectures
- Limited items: Zeitaku Mos Burger ¥810 / Zeitaku Mos Cheeseburger ¥890
- Occasion: Ibaraki Prefecture Day on November 13
Sales Schedule
Sales begin on Friday, November 13, which is Ibaraki Prefecture Day itself. They continue through Saturday, November 14, and end on Sunday, November 15. The three-day window runs from a weekday Friday into the weekend.
Zeitaku Mos Burger: A Founding-Era Menu Item, Reimagined
The Zeitaku Mos Burger is a modern take on a menu item that MOS Burger sold from its founding era until 1990. A burger that was once served in stores now returns for a limited time in a form suited to today.
Its defining feature is its sheer volume. It is generously built with ingredients such as two patties, sliced tomato, and meat sauce, making for a hearty, satisfying burger that lives up to the “zeitaku” name.
Zeitaku Mos Burger Highlights
- A modern arrangement of a menu item sold from the founding era until 1990
- Built with two patties for extra volume
- Generous use of ingredients such as sliced tomato and meat sauce
- Price: ¥810
Zeitaku Mos Cheeseburger: Two Extra Slices of Cheese
Sold alongside it, the Zeitaku Mos Cheeseburger adds two slices of cheese to the Zeitaku Mos Burger. Pairing two patties with two slices of cheese makes it even richer. It is priced at ¥890, ¥80 more than the Zeitaku Mos Burger.
How the Two Limited Burgers Differ
- Zeitaku Mos Burger (¥810): Two patties, sliced tomato, meat sauce, and more
- Zeitaku Mos Cheeseburger (¥890): All of the above plus two slices of cheese
What Is Ibaraki Prefecture Day?
Ibaraki Prefecture Day, the occasion for this event, falls on November 13. Ibaraki Prefecture established the day in 1968, in honor of November 13, 1871, when the name “Ibaraki Prefecture” was first used. It is described as a day for residents to learn about their home region, raise their awareness of self-government, and wish for richer lives and the prefecture’s continued progress.
Background: A Thank-You to the Local Community
MOS Food Services is offering these limited items on Ibaraki Prefecture Day, a day that deepens appreciation for Ibaraki’s history and local pride. The aim is to express everyday gratitude to local customers. Participating stores include MOS Burger locations in Chiba Prefecture as well as Ibaraki. As a member of the local community, the company says it aims to build close ties with customers, energize the entire Chiba and Ibaraki area, and create stores that will be loved for years to come.
MOS Food Services’ Commitment
MOS Food Services has consistently worked to offer products rooted in the principles of “deliciousness, safety, and health,” together with “service from the heart, with a smile.” Through its cook-after-order approach, upheld since its founding, and product development that values Japanese food culture, the company strives to fulfill its mission: “To make people around the world happy through food.”
Summary: Don’t Miss Three Days of Indulgence
“Lucky Mos Festa ~Autumn Customer Appreciation Festival~” runs at all MOS Burger stores in Chiba and Ibaraki Prefectures. It offers limited burgers that reimagine a menu item MOS Burger sold from its founding era until 1990. They are available only for three days, from Friday, November 13 to Sunday, November 15. Will you choose the two-patty Zeitaku Mos Burger (¥810) or the Zeitaku Mos Cheeseburger (¥890) with two extra slices of cheese? Be sure to check them out while you can.
Source: press release by 株式会社モスフードサービス (PR TIMES, in Japanese)
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