Interestingly, there is already a heli skiing operator in that area. And they complain about the red tape. They have been there since 2016 ... ish.
https://www.hokkaidobackcountryclub.com/en/heli-skiing/
A few more points.
I suppose you speak Japanese. If not, you either learn it real fast or just stop your project now. To fly in Japan commercially, you need to speak and read Japanese, because you will have to pass the tests for commercial pilot and IFR for a Japanese license. The validation - recognition of your canadian license - will only get you to private pilot.
What do you want with an IFR rated helicopter? You can not use IFR for heli skiing. You just don't fly, when the weather is IMC. There are no instrument approaches to heli skiing sites. IFR rating is always a good thing for pilots, but in heli skiing you do not fly IFR. Just no. You can't legally and if you do it anyway, you will end up in cumulus granitus.
You need a hangar. You can not let the ship outside in the winter.
You need a place for the hangar, preferably close to hotels and slopes. Therefore you need buliding permits and helicopter operation permits, since you are operating from a private heliport.
You need a FOM (Flight Operations Manual) for your company. That alone will cost you a lot of time and money and the Japanese CAA has to accept it in the end for your company. In the US this is called a part 135 or air taxi operation.
You need certified maintenance personell.
You need fuel on site. Therefore you need permits to handle fuel.
You need experienced pilots as chief pilots. Nobody will let you do this operation on 500 total hours. Especially not the insurance companies.
You need office staff to sell your flights. You can not do both, flying and selling on the phone.
You need mountain guides that fly with you.
You need permits from the forestry agency, where you can do heli skiing.
You need way more money than just 4.5M. That covers the helicopter, but operating a helicopter is very expensive. Just as an example. HBC (the ones above) have two minutes to fly up to the mountain. Therefore one rotation (up and down) takes appox. 5 Minutes. You have to do this continuously for hours, without shutting the helicopter down. If you shut down every 5 minutes, your turbine will wear out quite fast, because every start up of the turbine is hard on it. Your turbine could reach TBO only because of cycles way before you reach TBO by hours. An overhaul of a C47 will cost a lot of money.
As a single ship, single low time pilot operation, there is probably no country in the world, that would give you an air taxi operation permit. And as mentioned, Japan does not make it easy, on the contrary.
Flying a helicopter is easy compared to operating one, let alone in Japan. BTW, if you would try to do this in the US, you would have exactly the same problems. Just a bit less red tape. With 500 hours the insurance companies would be rather reluctant do let you do this kind of operation.
Take your money and buy into an operation, if you absolutely want to fly and then learn it from the ground up. In general, aviation businesses are not your run of the mill businesses you can just hit the ground running. There is a lot to learn and if you think you can do it without a very deep understanding about regulations and operation, you will fail. The FAA Helicopter Handbook is not even close to enough you must know about helicopters.