 If you liked Evangelion Movie 3: Q |  ...then you might like Persona 3 the Movie 3: Falling Down |
I was reminded of Persona 3: Falling Down while watching this. Both movies have some sort of bonding between two boys trying to get to know eachother and become friends, both are also very depressing. Ryoji and Kaworu are also quite similar too, both eager to get closer to the protagonist (and some other spoiler related things, but that's for you to find out!). Needless to say, if you liked the relationship between Kaworu and Shinji in 3.0, you'll most likely be a fan of Ryoji and Makoto's relationship too.