I bought this particular treat for the package plain and simple. I love the drawing of the kid on the package, and I love the retro style of the design of this package. Fortunately, it's not an expensive bar, in fact it's really cheap cost wise. Where many chocolate bars cost between 1 and 2 hundred yen in Japan, this one goes for as little as 88. So, you can't really expect the highest quality chocolate out of this bar. The fact that it's a bitter chocolate does work in its favour, because that tells me that some thought went into chocolate quality. But this is all from the package, the real story is in the chocolate itself.
The thing is, this chocolate is pretty waxy; it's not as bad as you might think, but it's no high-grade chocolate either. The flavour on the other hand is pretty good. It really is bitter and the chocolate flavour bursts out with every bite. It's a shame that it's not a pure melt in your mouth treat, but for an inexpensive chocolate bar it's pretty darn good.
I'd say if you're on the streets of Japan and you need chocolate because of a life or death matter, but you only have 100 yen, this is truly a good buy. However, for the most part I'd say if you have a little more money you might want to pass it up. Unless you really like the wrapper like I did, in which case you can always say it's a piece of art with a free chocolate bar, and all for the low price of 88 yen.