Tokyo has one vending machine per 23 people. Hot and cold drinks, snacks, ice cream, sometimes umbrellas — all 24/7.
Hot drinks (red labels) in winter, cold (blue) in summer. Coffee in cans is surprisingly good — Boss, Georgia, and Asahi Wonda are all legit.
Some machines accept Suica/Pasmo. Most accept coins and 1,000 yen notes.