Most clubhouses in Japan are on the extravagant side, a salute to the bubble economy which saw a golf explosion in Japan and with it hugely, exuberant membership fees.
When you arrive at the clubhouse there will always be a few staff ready to take your bags and give a warm welcome. Make sure to take what you need from your golf bag, as it will be whisked off to your designated cart almost straight away.
When you enter the clubhouse head straight for the reception where you will be asked to fill in a registration form, there will be lots of questions in Japanese here, but really all they need is your name (in block), email and telephone number, it's always good to leave your address in Japan or hotel name too.
Once you have completed the form they will give you a locker wallet containing a key for your locker and a scorecard. This locker wallet is very important as most clubs operate a locker number system, whereby you use your locker number for purchases in the pro shop, restaurant etc. and then settle your bill just before leaving on check-out at the reception.
When you get to the locker room, it may be necessary to remove your shoes, if this is the case take them with you to your locker. For valuables, there are small safety boxes in or close to the locker room. Once you have left your belongings in the locker/safe you are good to head out to the practice facilities if time, or your cart and out to the course.
Note about dress codes:
In most public Golf courses in Japan, they are not as strict on dress codes as the private courses, but it is always good to be smart/casual - a collared shirt and trousers (not denim). With the hot summers in Japan, most courses are OK with shorts and a polo shirt. If you are in doubt about it best to ask the course (or whoever booked for you) before you go.