Honestly it's a decent level of Echiness. It only feels like Porn because of the way the fan-service teases you, they aren't really doing anything. But yeah the topics are more Hentai-like that you'd expect this to be more of a Hentai!
But what's the point of waiting till graduation? Shouldn't it be marriage? There's no difference if it's till graduation after all..
I really liked the Heroine and unique character design. Usually, she's a side character in other animes'.
It was good at first but it quickly becomes a Harem novel.