What an Imperial-7 Japanese Lab Actually Looks Like Inside

The Imperial 7 (旧帝大, kyū-teidai) refers to the seven former Imperial universities: Tokyo, Kyoto, Tohoku, Hokkaido, Osaka, Nagoya, and Kyushu. They are not a formal alliance — they are a historical grouping that survives because Japanese employers and academia still rank them at the top. If you are choosing between, say, the University of Tokyo and Kyoto University, you are choosing between two of the seven; the other five sit at roughly the same domestic prestige tier with regional variations.

A typical STEM lab at an Imperial 7 university occupies one or two floors of an aging concrete engineering building. You get one desk in a shared room of 8–20 students, a locker for your bag, a name tag on the door, and a slot in the seminar-room shoe rack. The equipment room is locked except during work hours. There is usually a small kitchenette with an electric kettle, a microwave older than you are, and a fridge labelled with student names.

The professor's office is a separate room down the hall. You knock before entering. Most of the day-to-day mentoring happens not from the professor but from your assigned senpai, who sits in the same shared student room.

The skeleton of a week is the seminar (zemi, ゼミ). Most labs run a weekly group seminar — usually a 2-hour block on Monday or Friday — where one student presents a paper or their own progress to the whole group. Attendance is non-negotiable. If you are traveling, you send a message and a written summary. There is also typically a smaller subgroup meeting once a week where 3–5 students working on similar topics workshop in detail.

Beyond seminars, most labs operate on core hours. The convention I have seen at three different Imperial 7 labs is roughly 10:00 to 17:00 weekday presence expected, with flexibility before and after. Some wet-chemistry and biology labs are stricter — full 9-to-7 days are normal. Computer science and math labs trend looser. The inside-the-Japanese-lab-system guide breaks down the variations across fields if you want a wider sample.

Every new student is assigned a direct senpai — usually a second-year master's or a first-year PhD — who handles the practical onboarding the professor has no time for. Lab notebook conventions, equipment booking, where to find spare cables, how to formally ask the professor for a meeting, what to wear to the lab dinner. You ask your senpai before you ask the professor. This is not optional culture; it is how the lab actually runs.

The kohai (junior) side of the relationship comes with real obligations: arriving 5 minutes earlier than the senpai for shared tasks, taking notes in group meetings, sometimes pouring drinks at the lab dinner. The first time you see a fellow international student get this wrong — leaving the seminar room before the senpai stands up, for example — you understand why the lab handbook never mentions it.

Even in officially "English-conducted" programs, the lab's working language often drifts into Japanese the moment the professor leaves the room. Group chat is in Japanese. Building announcements are in Japanese. The cleaning lady speaks no English. The lab dinner is 95% Japanese. Most of my friends arrived with N3, were fine in research, and struggled socially for the first 6 months.

N2 is the level at which you stop translating in your head during the lab dinner. N3 is the level at which you can understand the seminar agenda but not the side jokes.

You greet the professor with otsukare-sama desu when leaving for the day, even if you did not interact. You do not eat at your desk in shared rooms; the kitchenette exists for a reason. If you take the last of the coffee, you start a new pot. If you book the seminar room, you book it through the senpai system, not the professor's calendar. You arrive 10 minutes before the seminar to set up chairs. You stay 10 minutes after to clean up. Skip any of these and someone notices, even if nobody mentions it.

Healthy labs: you can name the last 3 graduates and where they went. The professor takes Christmas off. The senpai system is functional, not abusive. Drinking is optional. Publications appear at a steady cadence. Students leave the building before 8 PM most days.

Red flags: the professor is in the building seven days a week and expects the same. No student has graduated in over 18 months. Vacation requests are met with sighs. The drinking culture is mandatory and frequent. There is one very obviously favorite student and several invisible ones. Your potential advisor cannot tell you when their last student published.