So i have read the first 9 Chapters.
Zokusei is like a hetero version of the Yuri Manga Otome no Teikoku.

The first Chapters shows the different characters. Always a Girl who meet a boy.
The girls are all different so everyone find her favorite Girls. From the inviolable to the neighbor Girl and the little Sister character and a lot more.

The Chapters are very Short. no Chapter is longer than 9-10 pages. But thats not a problem a chapter is so fast to read.

The art is very good. Some Chracters have very big tits but thats not the matter.
I mean look at Eiken^^

last but not least.
A great manga for all fans of Eiken and people who loves read Ecchi.