MOS (Mountain Ocean, Sun) Food Services announced on the 18th that it would open all 1,400 of its MOS Burger outlets at 7:00 a.m. by the end of the year. The hamburger chain already operates 430 of its stores from that early hour and plans to progressively open the remainder at that time. McDonald’s Japan had been aggressive in the breakfast space with its “Morning Mac” campaign, and MOS Burger’s move is expected to intensify competition. At a press conference MOS President and CEO Atsushi Sakurada explained that the number of people eating breakfast out was increasing, especially among the elderly and working women, adding, “Change in the morning person market is accelerating. I want to strengthen our preparedness.”
Could this mean additional woes for an already troubled McDonald’s Japan?
MOS started trialing a morning menu at 49 of its outlets this February. Items include a breakfast set consisting of an egg rice burger, miso soup and pickled vegetables (380 yen), and five different types of pancakes at 190 yen each. The chain plans to introduce its morning menu at other stores from this point on.
Additionally, for the first time in six years, the company will make changes to its signature MOS Hamburger and other menu items, with the new offerings being available from the 23rd. To date MOS has used a mixture of minced pork and beef for its burger patties; however, from the 23rd it will use 100% Australian beef. It is also making changes to its burger sauce, strengthening seasonings to produce a richer more robust flavor profile.
Source: Vippers

Mos Burger Chimes in on McDonald’s 60 Second Service, Reminds People How Fast Mos Burger Ain’t
A tale of two tonkatsu burgers – We pit McDonald’s pork cutlet sandwich against Mos Burger’s
We combine McDonald’s and MOS Burger for forbidden deliciousness
Lotteria unveils its first rice burgers, but how do they compare to Mos Burger and McDonald’s?
Japanese-style curry rice coming to McDonald’s Japan? Mysterious tweet has fans’ fingers crossed
Nine amazing off-the-beaten-path cherry blossom spots in Japan for yaezakura and shidarezakura
10 awesome Tokyo cherry blossom festivals and experiences for this year’s sakura season
Stunning central Japan wisteria festival is like a purple fantasy straight out of a Ghibli movie
Starbucks Japan releases new My Fruit³ Frappuccino at only 34 stores around the country
Japan’s Mos Burger discontinues old teriyaki burger and rolls out new recipe, but is it as good?
New cherry blossom party picnic essential: This super-handy folding cardboard table
Studio Ghibli adds new anime tumblers to its cool streetwear brand in Japan
Godiva now makes tofu in Japan, and sakura chocolate tofu too![Taste test]
Japanese city abolishes 88th birthday celebratory money gift because people are living longer
Expo 2025 mascot Myaku-Myaku to release tastefully erotic photo book
Train station platform ramen store closes its doors on half a century of history in Tokyo
Japanese onsen egg maker from 100-yen store Daiso needs to be on your shopping list
Cherry blossoms begin blooming in Japan with record-early starts for sakura season
Studio Ghibli adds new Mother’s Day gift sets to its anime collection in Japan
The next time you’re feeling stressed out, you could relax on a Pokémon Psyduck chair from Japan
Tokyo government organizes food truck event to clear out delinquent/homeless teen gathering area
Virtual idol Hatsune Miku redesigned with look that adds new elements and brings back old ones
When will the cherry blossoms reach full bloom in Japan this year?[Forecast]
7-Eleven Japan’s giant fried chicken skewer would be too big to eat, so it’s really for cuddling
Starbucks Japan unveils new sakura cherry blossom collection for hanami season 2026
Studio Ghibli releases Catbus pullback keychain that runs like the anime character
Nine great places to see spring flowers in Japan, as chosen by travelers (with almost no sakura)
The 10 most annoying things foreign tourists do on Japanese trains, according to locals
Starbucks Japan releases first-ever Hinamatsuri Girls’ Day Frappuccino
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
McDonald’s Japan’s new kalbi koshihikari rice burger and its friends only come out after sundown
McDonald’s Japan unveils moon-viewing sukiyaki burgers and sweets for tsukimi season
Tsukimi burger season heats up as McDonald’s Japan unveils new moon-viewing burger lineup【Pics】
McDonald’s Japan’s first-ever rice fish burger is here, but was it worth the wait?【Taste test】
Godzilla vs McDonald’s! King of monsters takes on fast food king’s new Godzilla Burgers【Video】
McDonald’s Japan expands rice burger menu with first-ever rice fish burger, two more options
McDonald’s to Sell McGriddles All Day Long, It’s about Time!
We try McDonald’s Avocado Beef, see if it’s as lame as people on Twitter are suggesting
McDonald’s Japan’s first-ever rice burgers are here, and we try them before they go on sale
Godzilla burgers appear at McDonald’s Japan, and t’s time to eat them all!【Taste test】
Why does MOS Burger break from actual burgers for their Japanese-style menu?
McDonald’s Japan adds first-ever shrimp rice burger to menu in gohan sandwich expansion
McDonald’s releases new rice burgers in Japan
Tonkatsu McBurger gets an upgrade and joins the regular McDonald’s Japan menu, people still upset
McDonald’s Japan asks that you please be careful with its new extra-spicy rice burger