Because we can't leave Pink/Black and Green out now.
Bamboo Blade really had a lot. Kendo, moe, Blade Braver, Saya and Kirino's heavy romantic two girl friendship (Saya's, at least) and the buttocks that can leave a Nintendo DS broken. Across the OSTs, Tama, Kirino and Sayako's character songs appeared, but the last two contain the songs for Miya-Miya (Aka Ban) and Satori (Shiro Ban). Plus dramas, of course, to add just a little bit more onto the story.