I update this review to make it no-spoiler and more clear.
This series is the only one I found with all 3 the following characteristics:
1. It is bluntly realistic.
2. It treats topics which are forbidden by many who live in the past (especially in the west).
3. It does it with ease, lightness.
And if you think that point 2 and 3 are in contradiction, because something for you serious cannot be explained lightly, then you are exactly the type who should not watch this because you forget the most important point 1: You should never try to hide the truth.
This series is the only one I found with all 3 the following characteristics:
1. It is bluntly realistic.
2. It treats topics which are forbidden by many who live in the past (especially in the west).
3. It does it with ease, lightness.
And if you think that point 2 and 3 are in contradiction, because something for you serious cannot be explained lightly, then you are exactly the type who should not watch this because you forget the most important point 1: You should never try to hide the truth.