This is a highly entertaining and original manga. The story begins with an ex yakuza (Watase) trying to save an ex boxer (Moriya) from falling off a bridge, only to end up dying with him. That is when they enter "zero point", basically the space in time hovering between life and death. They are then appointed to collect human fluid to, get this, save the world (so to speak). The story has a well developed plot line and most of the questions posed at the beginning are nicely wrapped up in the end. The characters each have a back story as to how they left theirold lifestyles and we learn about this from the time loop they get stuck in, by the "alien woman". All of the elements the mangaka used fit nicely together and seem to make sense, even if it is just a bit sci-fi.

The art is well done, I enjoyed the female character the best, which is odd for me, because I generally go for the men, it is yaoi after all! I love the pig tails she has in some scenes.

Overall it is a great manga to read, give it a try!