I started to read this, because I thought the premise interesting, but sadly it doesn`t really explore the ramifications of a male-only world more than what is seen in the first 2 chapters: young men before the end of puberty as pseudo-women and homosexual relationships between them and older men. The story itself also went out there with psi powers and "will of the earth", so for me it wasn`t really a good manga. I wanted to read a good sci-fi story, which this isn´t in my opinion.
It is a manga mostly to oogle at (semi)-naked males in homosexual relationships.