Kishidan (founded in 2000) is a Japanese pop group and they mainly play retro rock. Their music is more pop than rock, while their image is more rock than pop. Their music isn’t that interesting but their outfits are!
They mainly dress up old fashioned Japanese school uniforms (gakuran) with bosozoku haircuts. I guess their target audience should be the wannabe bosozoku school boys. A good example is this video:
Their songs are mainly about motorcycles, conflicts at school, hanging out with your gang and adolescent love.
And in this video you can see the school boys hang out with the gangs and ending up as a bosozoku themselves while having some adolecent love with a teen girl:
But if you look at this video you probably slowly get the idea what they really are: a joke group set up by big record companies to earn loads of money for them: