Gantz TPB Volume 06 (Mature)

Life is complicated for Kei Kurono, possibly the horniest teen in Tokyo. So far he's had to deal with sleeping next to a sad but excessively cute and endowed girl who asked to be his 'pet'; the fact that he's apparently really a fax copy of himself -- the real version having died in the first volume; and falling out of the sky after being dropped by some sort of alien eagle.