Haru drama CD

Nitta-sensei announced on her website that a "Haru wo Daiteita 9" drama CD is being released. Normally I don't buy drama cds because my Japanese isn't good enough to really understand the dialogue. If I'm lucky I can pick up on maybe half of what's being said, but usually more like a quarter to a third--even with a decent vocabulary it's hard to follow along with a native speaker talking at a fast pace. But I just may have to track down an import copy of this CD because I noticed that Onozuka is on the list of characters! (Along with Katou and Iwaki, of course.) And I'm pretty sure that Yoshizumi, Asano, and Miyasaka are also listed, so it's got to be full of win! I'm so curious to know what the story is about! Onozuka, Miyasaka, Yoshizumi, and Asano have never appeared together in the manga, so it has to be either an original story, or the CD is dramatizing at least two or three separate chapters from the manga.