Haneda/Narita Airport to Mt.Fuji

I am going to Japan next month and I've decided to stay in Mt. Fuji for about 4 days. Do you guys know any way to go directly to Mt. Fuji from Haneda/Narita Airport? I check a few bus heading to fujikyu but that bus needs to be reserved first. Do they have any bus ticket that sells directly at counter or online site?

See the access info pages of both airport web sites.
There is NOT only a way to go directly from the airports.

Bus from Narita: http://bus-en.fujikyu.co.jp/highway/detail/id/39/
Bus from Haneda: http://bus-en.fujikyu.co.jp/highway/detail/id/4/

Booking information is at the bottom of the pages. Both buses can be booked in English by phone, and the one from Narita online too.

Narita Express train (only on certain days): https://www.eki-net.com/pc/jreast-shinkansen-reservation/English/wb/co...

Can be booked online: https://www.eki-net.com/pc/jreast-shinkansen-reservation/English/wb/co...

I opened the website. It says:
- Reservations only. (However, tickets may be purchased without reservation if there are vacant seats).
- Reservations are accepted from exactly one month prior to departure (for months with differing days, it may be available from the first day of the following month).

If the ones from Haneda need to be book by calling (phone), the ones from overseas can't do that. I'm from Malaysia and I can't possibly risk my bill by calling just to make my reservation for seats by calling.

If you don't want to call, you have to buy a ticket on the spot and hope there are still vacant seats.

Or you can book online in Japanese if you know someone who can help you with that.

I can read Japanese. Can you give me the link? I want to book.