I finished my first two books for the challenge: Strangers by Taichi Yamada and When the Emperor was Divine by Julie Otsuka.
I don't think I could have loved When the Emperor was Divine any more. It tells the story of a nameless Japanese-American family that is sent to an internment camp during World War II, and it's a sad, subtle and very moving book. The writing is absolutely perfect. Julie Otsuka managed to convey powerful emotions while remaining gentle and restrained. You can read my full review here.
I have somewhat mixed feelings about Strangers. A ghost story set in modern Tokyo, Strangers is very haunting and atmospheric. I loved it until the last few chapters, but I was somewhat taken aback by the twist at the end. My review can be found here.