Matsuya is a chain in Shinjuku, Tokyo that serves gyudon. Its menu includes negi onsen tamago gyudon and galbi horumon donburi, and orders are placed at an entrance kiosk. It is open 24 hours, so it can be used at any time of day, and the gyudon comes with soup. Menu items with meat such as samgyeopsal (pork belly) are oily and greasy.