Just finished:
"Battle Royale" by Koushun Takami

currently reading:
"The Human Be-In" by Helen Swick Perry

Want to read next:
"Out" by Natsuo Kirino
"Hwangjini" by Hong Seok-Jung (but I don't know if my Korean is really good enough, it would be a challenging read)
or maybe "Heart of a Dog" by Mikhail Bulgakov