Originally Posted by twww

Yes. You will not exactly be doing it solo as there will be many people on the mountain alongside with you.

If you are not prepared for such a climb, I'd suggest to do it another time.
Tokyo, the base of the mountain may be Hot, but the Higher you climb, the colder it gets. If it rains, you will get wet.

My suggestion, if you still want to visit the area, is just view it from below.