To get to Marunouchi Oazo, you can access it directly from Otemachi Station, or it's a 1-minute walk from the Marunouchi North Exit underground passage of JR Tokyo Station.
Maruzen, which handles books and stationery, is located on the 1st to 4th floors and is relatively busy on weekends. There are also restaurants and cafes.
And, behind the escalator on the 1st floor of Marunouchi Oazo, there is a seating area in the central atrium.

It's called OO Plaza!

Many benches and sofas are available.
As it is an event space, the seats may be removed or concentrated in one place during events such as Christmas.
Why not use it for shopping at Marunouchi Oazo, or as a seating rest area around Otemachi Station?



