Tips on where to rent/buy gears (like sleeping bags, tent, headlamps) around Tokyo?

by Jane
(Japan)

Hello! My name is Jane and I am an Indonesian student who just came to Japan to study Japanese in a particular university in Tokyo.

So, I have hiked a few mountains in Indonesia, and I wanted to continue my hiking experience here in Japan.

I'm interested in mountains like Kita-dake and Oku-hotaka-dake and I'm planning to hike this summer. And not to forget Fuji-san too.

But unfortunately I have left all of my gears back in Indonesia.

So, can I have your advice about tips to rent/buy gears (like sleeping bags, tent, headlamps) around Tokyo?

Thank you for your time answering my question.

Jane