A piece of fiction with a central theme that most of everything ties into, and exhausts almost all dimensions of its medium to explore. The theme is that of Commitment and Regret and the way it explores this is through an eroge VN. That said, this game is dripping with so much empathy and emotion while being designed to be engaged with from the single perspective of YOU playing it. Spoiling or divulging anything would be a disservice to it.
Play the JAST USA version or the Director's Cut patched Steam version. Everything in this game is made with a purpose that feeds back into itself, so cutting anything down or out is unimaginable and just isn't the same experience.