The story unfolds like this:
For some reason, Emeka is in love with the 5 main protagonists.
There are no routes. It is a linear story that tells how Emeka's life develops as you get to know more and more about the lives of the other characters.
The points and decisions don't change the story (at least, not for now), what they are used for is to unlock certain "naughty" scenes and near the end of the visual novel, depending on the points and decisions, you can be with one or another character, or maybe none at all.