Where can I buy Rerise hair color?

The hair color I am interested in is a natural reblack. Name Rerise by Kao or Kombu by Rishiri. Where do you buy such products in Japan? Supermarket? Pharmacy?

Correct me if I'm mistaken, but are you perhaps looking for the "Rishiri-Kombu Hair Color Treatment" which is a product by Sastty?

It's a relatively natural treatment paste that is made from kelp, and it dies your hair easily and naturally in sort of a shade.

If so, you can buy them at many drug stores as well as on-line.
https://lp.sastty.com/3ce3bd7d/index.html?utm_source=google&utm_campai...

Meanwhile, I don't think Kao sells anything similar to the name you've given us. Here is Kao's official website:
https://www.kao.com/jp/brands/

https://www.kao.co.jp/rerise/

Kao indeed has the hair dye/hair care series gReriseh under their gBlauneh product group.

They have a color type called greblack,h so maybe thatfs the one you are after. I would go to big drugstore chains like Tsuruha Drug, Matsumoto Kiyoshi and the like (and maybe mass merchandiser/discount stores like Yodobashi too).

Ah! Thank you, AK! And all I had to do was to Google "rerise ‰Ô‰€". So sorry about that!