Reusing characters the same way that Tsubasa Chronicles reuses old CLAMP characters. Same name (for the most part, a lot of the family names are changed), same face, but a different person. Its a different world, some have the same personality (Nao, Shizuru, Haruka, Chie) and other are varied levels of different from their old selves (Shiho, Mashiro, and probably Midori).