First here is a short background about Yoshinoya. 

Yoshinoya's roots came from founder Eikichi Matsuda. Born in 1899, their humble beginnings in Nihonbashi, a fish market in Chuo-ku Tokyo is their first home. Mr. Matsuda created delicious rice and beef recipe known as Gyudon, as his first dish. And because Mr. Matsuda's cooking became an instant hit, he named his store from his birthplace, Yoshino-Cho, Osaka. 

But when Japan was hit by the Great Kanto Earthquake, Yoshinoya had to move to Tsukiji with the rest of the fish market. There, hungry patrons continued to enjoy their favorite Gyudon, or Beef Bowl. Only in 1946 did Mr. Matsuda's son, Mizuho, turned Yoshinoya into a 24-hour restaurant. After 12 years, Yoshinoya had become a corporate company for patrons all over Japan is clamoring for its dishes. They now boasts of more than 1,000 outlets in Japan, while all in all, they have 1,400 branches all over the world namely: USA, HongKong, China, Singapore, Malaysia, Taiwan, Indonesia, Thailand and here in the Philippines.