How much Non NTR content compared to the NTR route?
I disagree with the answer you received. I did not finish the game though...
At the beginning you've scenes which introduce the dynamics within the couple and how they create the cafe. Then at the end of each day there a scene which depicts the past and current actions and interactions btwn the characters. You get to know them. Plus you can choose to interact with one girl every day, some scenes are one line or two others are a few minutes long and develop the relation you have with them. So there is a "vanilla" story in which you might end up having three girlfriends, (once again i did not finish the game) and an affair with the bakery girl (which you seem not to be able to avoid, she is hot though) and eventually an affair with some female customers, if you so choose (i do not know if there are actual scenes or just a suggestion of it).
As for the customers, the girls need to flirt and exchange their phone number with them and you need to give them a triangle pin for them to begin to get naughty, so far i got only one such scene but it was well down...