Neon Genesis Evangelion
The show is quite dramatic and tense at times,
but the intro, at least the music, is quite the opposite.
I'm not trying to knock Evangelion as a show,
just stating that is different from what I might be used to in the States.
If this show originated in the states, the theme music would have been more tense. I mean, Evangelion has tense action, as well as many tense moments for the characters.