Bathroom mirrors that don’t steam up after taking a shower.
Vending machines that are competent at accepting cash. Everywhere else that I’ve been to, you have to smoothen the bill and make sure it has no wrinkles or bended corners, and even then the machine would sometimes give you a hard time. In Japan, you just insert a stack (!) of bills, and the machine will count them within seconds, and also give you change in bills, and not a gazillion of coins.
Gates at the train stations are also better than everywhere else. You don’t have to wait for the person in front of you to pass the gate, you just insert your ticket and go. You also don’t need to look for arrows or notches or whatever on the ticket to insert it correctly.
Electric kettles that are very quiet and keep the water hot for a very long time.
Trains where all seats face the front, so you don’t have to sit against the direction of travel.
What's some amazing technology they have in Japan that's very normal to them but would blow our minds here in the US and western world?