In Japan, seeing staff inside a restaurant with the lights on does not necessarily mean the restaurant is open. Before opening time, employees may already be cooking, cleaning, or preparing the dining area, so a place can look active even though customers are not yet being admitted.
The clearest clue is usually the sign at the entrance. If it says eigyochu (営業中), the restaurant is open. If it says junbichu (準備中), it is still preparing and customers should normally wait outside. In practical terms, junbichu means “not open yet,” even though the literal meaning is closer to “preparing.”
At some Japanese restaurants, especially traditional restaurants, izakaya, and soba shops, a noren curtain can also be a useful clue. Many places hang the curtain when they open and take it down when they close. This is not a universal rule, however, so the presence or absence of a noren should not be treated as the only sign.
The slightly confusing situation is when you arrive and the restaurant still says junbichu. A Japanese diner might first think, “Oh, they are still preparing,” and then check the opening time on a phone. If the listed opening time has already passed, they may look through the window to see whether the staff still seem to be preparing or whether the restaurant looks close to opening.
If several minutes pass and nothing changes, there is no need to wait indefinitely. If a staff member is nearby, it is perfectly reasonable to ask, “What time do you open?” The usual instinct is not to walk in while the junbichu sign is still displayed, but neither is it necessary to stand outside forever when the stated opening time has already passed.
For a foreign diner, the safest approach is therefore to look at the entrance sign first. If it says junbichu, wait outside. If the timing seems unusual, check the listed hours, watch for a moment, and ask if necessary. In Japan, “there are people inside” is not the same as “the restaurant is open.” What matters is whether the restaurant is visibly signaling that customers may enter.
