Maekawa UNAGI & Japanese cuisine Marunouchi is a Japanese restaurant in Tokyo that serves unagi donburi and shirayaki. It sits on the fifth floor of the Shin-Marunouchi Building, a one-minute walk from Tokyo Station. The restaurant is the second branch of Komagata Maekawa, which has operated in Asakusa since the Edo period, and the eel is grilled Kanto-style until tender. Seating includes counter and table options, with partitions separating adjacent seats for a quiet meal, and prices run high for an eel restaurant.