Damn, I liked this A LOT. The sync is especially gorgeous and the hard beats in the song really resonates with you, especially the section from 1:11-1:24 which was my favourite part.
Very nicely done there. Effects, masking, transitions, colouring all blend very smoothly together and made the video look sophisticated, just like a real MV.
Scene selection for the most part was great, though I'm not really sure I got the ending (or the full story behind the AMV). Was he saving her or their relationship? At first I thought it was their relationship, maybe they broke up or something and he's drowning himself in depression and then decides to go fix this mess. But the newspaper and the drowning scene at around 1:27 hint to me that maybe she was involved in some accident and he wanted to undo this? The ending scene of the um...light/sky and their hands together is also ambiguous. I can't tell if it's a sign he succeeded in saving her (so she's alive) or he joined her in heaven. XD Either way, I guess it's a happy ending for him though I would have liked some overlays of their memories or something just so it doesn't feel so empty. Nonetheless, I was impressed with how you managed to mix the different animes together so well, aside from the pretty obvious ones (TGWLTT, Steins;Gate, Shana) I couldn't really distinguish which scenes were from Tatami and which weren't so nice one there!
Another two gripes were some colour bleeds and repetitive camera movement that didn't quite work. Some of the camera works felt a little awkward when the scene already had movement in them, for example at 0:31 where the camera is moving out and he turns to face us, then at 0:42 where it's moving to the right and his head looks up. The colour bleeding (at 0:44) where you see the red colour....bleeding (XD) over the scene when fading out to black also looks weird. Well it could have been intentional but it just looks kinda wrong to me. A remedy for this is to use a black solid to do your fading instead of just the envelopes (if you're using sony vegas).
That being said, I did really enjoy the AMV. Very cool and stylish. Nice job Cecco! ^^