The Harada collection is located in the forest around lake Kawaguchiko close to the village with the same name. Everything is located in the area around Fuji san (Mt. Fuji). If you plan to visit the place it is highly recommended to go by car (definitely escorted by a Japanese). If a car is not available, bus connection from Tokyo started since last March. Fare is about 1.500 Yen (one way) and it takes about 2h and a half (if not caught in a traffic jam. In that case...). Bus leaves from Tokyo station, Yaesu exit. You will get off at the end of the line which is in the village of Kawaguchiko. We didn't find any other way to go to the museum (it would take about an hour on foot) so we took a taxi. It took us 5-10 mins and it cost 3.000 yen (one way). You can ask in the entrance of the car section of the museum to call a taxi for you to return to the village.
It is also not recommended to go by train. You will have to change trains at least 4 times and it wouldn't be pleasant to end up in Hokkaido. The special exhibition is inside a terribly lit hangar so it is recommended to take your best camera, flash, films etc with you. But it is worth the effort. There are: 1 A6M2, rear fuselage of a G4M, 1 K5Y Willow (replica), 9 engines, many parts from more, 2 Oerlicons, uniforms, propellers and many more small parts. There is of course a souvenir shop and you can get something to drink in the car section of the museum. You can take as many photos as you like (never enough...) but you can not touch, climb, ride, fly any of the exhibits.
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