Introducing Japanese Things

Please introduce Japanese customs, food and people.

It is said that Japanese are shy and too sensitive to to others. They have group-oriented mentality.
I have known the interesting fact.
Many Japanese are interested in blood types. They think of persons with A type blood  as shy and introverted. But the good poin of A type persons is that they are hard working, serious and considerate to others. Interstingly enough more than 60% of Japanese people have A type blood. In terms of the blood type, it is no wonder that many non-Japanese feel that Japanese are shy and not open-minded.