She co-produced that album if I recall correctly. She sang on 3 songs and did Kimochi lives with Mukai around the time. Inazawa had already left the band by then, unfortunately. Atsushi is a bitchin' drummer no doubt, but it wasn't until rearrangement of Kimochi that I could sit easy with Inazawa's drums never being present on that song again.
I'd have liked a Shiina cover of Zazenbeats Kemonostyle.
but seeing as she doesn't really have a band anymore...