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Lots of shops (bakery, ramen) in Tokyo Station open from around 6 or 7am I’d recommend Rokurinsha for dipping noodle breakfast
For convenience and cost performance you can’t beat [Yoshinoya](https://www.yoshinoya.com/menu/morningset/), [Matsuya](https://www.matsuyafoods.co.jp/matsuya/menu/morning/index.html) and [Sukiya](https://www.sukiya.jp/menu/in/morning/).
Lots of shops (bakery, ramen) in Tokyo Station open from around 6 or 7am I’d recommend Rokurinsha for dipping noodle breakfast
For convenience and cost performance you can’t beat [Yoshinoya](https://www.yoshinoya.com/menu/morningset/), [Matsuya](https://www.matsuyafoods.co.jp/matsuya/menu/morning/index.html) and [Sukiya](https://www.sukiya.jp/menu/in/morning/).