Rena Kawakami, the new lead singer for an idol group called 'PHOENIX, has recently taken the world by storm. Her upbeat attitude, combined with flirtatious nature have easily built up her fanbase amongst young men and women alike. To the relief of her fans, Rena conducts herself similarly to her idol persona, and is almost never seen without a smile. While she may be willing to let most things slide, messing with her younger twin sister (Sora Kawakami) is absolutely out of the question