Today is 25th/Nov.
That means within 1 month Christmas will come.
Many places in Tokyo are decorated by twinkling Christmas trees.
The tree I recommend you to see is Christmas tree under Tokyo Tower.

The tree is one of the biggest Christmas trees in Tokyo,
a live fir tree brought here from Gumma prefecture, quite far country.
Its Christmas tree and the illuminated Tokyo Tower are the very impressive night view.
You can check details here.
http://www.tokyotower.co.jp/


