After Dark is a short novel (novella) by Japanese author Haruki Murakami originally published in 2004 in Japan. There has been a number of translations into several languages between 2006-09. Below are a few non-Japanese book covers.
This short story is set in central Tokyo during one night (after midnight to before sunrise) and each chapter has an analog clock depicting the time. Characters include Mari, a young student spending the night reading at Denny’s (where the story opens) and her beautiful sister Eri, who has strangely gone into deep sleep (but not a coma) for the past 2 months, Takahashi, a trombone-playing student who has knows Eri, Korogi, a former female wrestler who is now managing a love hotel called Alphaville and Shirakawa, a salaryman working overnight who beat up a Chinese prostitute at the same love hotel.
Yup, that is a strange collection of characters indeed, with their connections and some weird activities.