I've written a very short ebook(let) called Air Miles and Hotel Points in Japan and it's free on any Kindle store worldwide for the next couple of days. For residents of Japan, it's aimed at beginners. If you're interested, I'd be really happy if you could check it out and give me some feedback. If you are feeling really generous, please write a short honest review on Amazon (if you're not feeling generous, just PM me ). Thanks!