If your going to go to Japan on holiday I would definitely recommend going in winter and going to the Sapporo snow festival. It was well worth it in my opinion.
Though the sign outside our hotel did say it was -16°C it really just makes the food stalls more appealing... and when your done go find a booze museum or somthing ~ bliss ~
I feel though this manga promises gyaru... I had no gyaru... tell me if you find one though.