In a nutshell, Mr. Nishikawa has been working to promote peace and understanding by serving free coffee to passersby in locations throughout the world. To see him in action, please look at the following YouTube video:
https://www.youtube.com/watch?v=eZLCqcicVdI
I really hope you will take the time to look at this video. I promise to give you your money back if you are sorry you did. ;)
I found this on the following webpage, which is an English-language interview with him about his activities:
[INTERVIEW] Just with a bicycle and coffee. “can we be free from money?” https://www.soenportland.co/story-en/31fuxjia6irkdikwc5bea6jl85jpwb
Mr. Nishikawa is doing this in Kumamoto City now. If you see him offering you free coffee, please stop and talk to him. I can’t wait to meet him myself but haven’t yet had the pleasure or doing so.
P.S. Here’s the link to RKK’s report: 「よかったら飲んでいきませんか?」無料でコーヒーを配る男性 世界を巡ってたどり着いた生き方 https://newsdig.tbs.co.jp/articles/rkk/222764?display=1