Yoshinoya "Gyudon Namimori Atama 120% Increase Campaign"
Alright, let's go to the Yoshinoya! (The source of the image is the official website)

At each Yoshinoya store, a "Gyudon Namimori Atama 120% Increase Campaign" will be held on January 24th for one day only (excluding some stores) to commemorate the 120th anniversary of its founding.

January 24th is said to be "the day when Emperor Meiji first tasted beef in 1872 (Meiji 5)." As "Beef Day", the beginning of modern beef culture in Japan, a one-day campaign was planned this time.

Yoshinoya "Gyudon Namimori Atama 120% Increase Campaign"

If you order a gyudon assortment, you will get a 120% increase in the amount of gyudon (the gyudon ingredient on top of the rice) for free. Limited time from 10:00 to 22:00.