Bump of Chicken's Wikipedia entry goes a long way to explaining the origins of their overly positive, earnest rock sound. There are several mentions of "anime," "otaku" and "video games" and well as introversion and reunited kindergarten friendships. This also explains why their music has made it onto various anime and game soundtracks. Personally, I don't think anyone can go wrong with a band that writes songs dedicated to Rei Ayanami.
