MOS Day

What Is MOS Day?

March 12 is "MOS Day," established by Mos Food Services to commemorate March 12, 1972 (Showa 47), when the first experimental "MOS Burger" store opened in front of Narimasu Station on the Tobu Tojo Line. The day is a chance to remember the company's founding spirit and to express gratitude to the customers who have supported it ever since. Since 1997, the company has given away plant seeds or growing kits around this day as a token of thanks, recalling its founding motto, "Let's do work that people are grateful for."

Made-in-Japan Dedication: A Short History

MOS Burger grew by thoroughly adapting to Japanese food culture and taste preferences.

• Pioneer of the Teriyaki Burger: On May 15, 1973, MOS Burger released the "Teriyaki Burger," with a sauce based on soy sauce and miso — said to be the world's first. The company has also designated May 15 as "Teriyaki Burger Day."
• The meaning behind "MOS": M stands for Mountain (noble and dignified, like a mountain), O for Ocean (a deep and generous heart, like the ocean), and S for Sun (a passion that never burns out, like the sun). The name was chosen by founder Satoshi Sakurada.
• Made-to-order cooking: MOS uses an "after-order" system where food is prepared fresh when ordered.

Interesting Facts About MOS Burger

• Inventor of the rice burger: In 1987, MOS launched the "Rice Burger," using grilled rice patties instead of buns - a groundbreaking product that made headlines.
• A 2.8-tsubo test store: The experimental store that opened at Narimasu on March 12, 1972, was just 2.8 tsubo (about 9 square meters). The first regular MOS Burger store, Narimasu, opened that June.
• Stores in Japan and abroad: MOS Burger has stores in all 47 prefectures of Japan and also operates in Taiwan, Singapore, Hong Kong and other parts of Asia.
• Region-specific burgers: The company regularly releases limited-edition menu items featuring local specialties from across Japan, supporting regional agriculture and promoting local culture.
• Another meaning of the name: The name of "MOS Co., Ltd.," a company founder Satoshi Sakurada started before Mos Food Services, is said to have also stood for "Merchandising Organizing System."

"Delicious" Connects Heart and Body

MOS Day is a day to appreciate the passion behind every burger and the smiles of the people who enjoy it. In an age that values efficiency, the value of things made with care and effort shines even brighter. On March 12, take your time enjoying your favorite menu item and savor the flavor of every ingredient. A satisfying meal generates new energy and a gentle boost for tomorrow.

Tips for Enjoying MOS Day

• Visit MOS Burger and enjoy a freshly made burger, appreciating the freshness of the ingredients and the care put into each one
• If you receive plant seeds, plant them and enjoy watching them sprout - a small daily joy of growth
• Take a moment to express gratitude to the people who support you with a kind word, fostering warm communication
• Following the spirit of "mountain, ocean, sun," reflect on your own goals and renew your passion and commitment

One Small Seed Can Blossom Into Joy

March 12 is a day when seeds of gratitude and effort you've planted quietly but surely begin to sprout. Just as MOS Burger grew from a tiny first step into a global brand, your own convictions have the power to move many hearts. May today be a day full of heartwarming encounters and the freshest, most flavorful experiences!