There is no plot.
Sure, there are lots of big-tiddy onee-chans, but there is no plot. No story. None whatsoever.
It is just like watching someone playing a management game with occasional sl00t.
The characters are dull as bricks, not least of which is the protagonist, who is so damned generic you could replace him with just about anyone else and it would make no difference.
The few that have any sort of personality whatsoever barely ever show up at all, almost as though the narrative is trying to force mediocrity down readers' throats.
So basically if you're reading this, it is probably for the tits. It has nothing else going for it. What a boring waste of time.