 If you liked Evangelion Movie 1: Jo |  ...then you might like Kizumonogatari I: Tekketsu-hen |
Both are very concerned with the postwar youth generation as a whole. Whilst heart under blade represents japan's soul itself, rei is the successive and repetitive generations personified. While araragi represents japanese youth in general, shinji is both salaryman and anime personified. Though they both are the closest parallels around in both anime and japanese live action (trust me I'd know), one is complete while the other has years to wait for it's long over due and delayed conclusion. I'd personally recommend both as starting points for their respective franchises. As they are both the shortest examples in each and are perfectly suited for it.