It's just so...
It's real, but with a happy ending so it seems.
While it's not the first of its kind, think Sabita Yoru Demo Koi Wa Sasayaku, I think it does a better job at the consequences of that sort of relationship.
I really hope this mangaka expands beyond just this couple, their style is actually quite beautiful.
As a math major, this is a really, really good basic guide to not only Linear Algebra, but the beginning of theoretical calculus. Like I would get this as a reference to give a very basic idea of things for students.