I have been a fan of a Japanese band, back number since I had heard its song "Hanataba" for the first time. It released an album last week. My mother likes it too and she bought me its album.
back number makes a lot of great songs.
It has many famous songs and they are very good but I think that some of infamous songs are better than them, for example "Setagaya love story".
I recommend that you should listen to it :-)