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
Japan has a new cute and clever sunblock for cat lovers
Japan’s izakaya pubs closing at record pace, failing to attract foreign tourists
Japanese vending machine find introduces us to a new drink you can’t get anywhere else
Starbucks Japan hoping fans will go bananas for its new mottainai banana affogato Frappuccino
The story of our reporter P.K. Sanjun’s heart attack
Super! Eel Bread takes Japanese sushi into uncharted territory
7-Eleven Japan releases their second lineup of upsized foods from a muffin to bukkake soba
Tokyo’s life-size Gundam anime mecha statue will be removed this summer
Kanji ice cream becomes a sell-out hit in Japan
McDonald’s Japan adds curry French fry flavor, regional-taste burgers to its menu with Gotochi Mac
Ichiraku Ramen-inspired ramen sets from Naruto anime pay homage to Naruto, Sasuke, and Sakura
Hundreds of rose bushes in bloom at Tokyo’s off-the-beaten-path, next-to-the-tracks flower street
This Tokyo Station sweets sensation sells out daily, but we finally got our hands on it
161-year-old Kyoto confectionary maker releases new edible Pokémon lineup
Studio Ghibli’s president is leaving the company. Will it change how they make anime?
7-Eleven Japan is releasing Greedy chocolate chip and whipped cream sandwiches
Let’s hike a Japanese mountain (that isn’t Mt. Fuji) – Mt. Tsukuba[Photos]
The average age of Japan’s hikikomori shut-ins is getting older, survey shows
Japan enters Golden Week vacation period, survey shows one in three plan to ride it out at home
Japan’s 5.3 million beautiful Hitachi Nemophila flowers are now in full bloom[Photos]
New Kyoto Converse sneakers celebrate Japan with traditional kimono fabrics for your feet
Japan’s new Pokémon jackets give you the look and powers of the Kanto starter trio
Japan now has gyoza doughnuts, and they taste like no other doughnut we’ve tried before
Studio Ghibli launches huge new anime movie T-shirt collection with special design details
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
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
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
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
McDonald’s Japan is selling Gundam burgers, endorsed by anime’s most charismatic antagonist【Vids】