Generally speaking, may be late post
There are few English speaking staffs in local diving centre and diving shop conducting a tour.
I know no one so far.
A Good way to enjoy dive in Japan is to have Japanese and English speaking acquaintance.
There are many Japanese working in the base but it is difficult to obtain proper one's under temp stay.
I mean interpreter is needed.
IZU peninsula
-East shore : car and train are available, JR and Izu-kyu(Izu-express), you can be picked up at the nearist station of a dive site or could be at convienient one.
-West shore : car is recommended
Average Fee : Yen 20,000 , 2 tanks boart dive with rental weights, DM, shower and so on......
Yen 13,000 : shore dive with the same
T's and C's.
Buddy dive is not allowed in many sites except Okinawa pref. (Do not ask me why)
Water Temp. 14 to 25C (winter to summer) so 5mm suit recommended
Others : Zushi, Manazuru
all above areas , clearness is not so good but good coral and fish could be found
Okinawa : Air plane ( from Haneda to respective islands in case of Kantoh area )
has WW level wonderful underwater views compaired to Red Sea, Saipan,Guam........
isolated islands are very good as well
Fee : cheaper than mainland
2 boat : 14,000
2 shore : 10,000
I think a fee is expensive using diving centre