SAWA has written lyrics for folk music unit 赤い靴 (The Red Shoes).
The unit is comprised of instrumentalist Kamiya Junpei, vocalist/songwriter Higashikawa Akiko as well as various other guest artists. SAWA's writing is featured on the track "Where to?", and the album is out on the fourth of April.
Also just a little heads up: SAWA's been performing at a string of lives since late 2011 as DJ alter-ego DJ WASA. Most of the dates have not been up on her official website, but she's been giving little mentions of it on her blog and twitter.