Have you ever just looked at an anime's drawing style and say "wow that looks terrible?" Well don't judge this one by appearance. I think the drawing style is well equipped for the fast paced actions scene that seem to arise every so often. The style is accompanied by the most interesting plot, where the idea of existence is put into perspective and the fabric of time and reality is ripped, sewn together then ripped again, as you are confused out of your mind.
The drama in this story is also as tearing as the fabric of time, as several "futures" of Haruka's friends are displayed, showing the saddest of outcomes. No really, the stuff they come up with is F****** sad.
What I would say is don't try to understand the physics in here unless you actually understand quantum physics.
10/10 Watch, live it, love it!