Actually, this was kind of fun. It's just a short music video from a band I never heard of before (ketchup mania), called 'Please Marry Me'. Girl proposes to guy, guy gets kidnapped, girl fights evil villain and her forces to save boy. The animation is done in the style of an "animated manga", with black and white images and some primary coloring (like the characters' hair), with the characters animated and lots of visual sound effects. May sound sort of cheesy, but it works in this case. And lots of action, too. It's apretty high-tempo pock-rock song, heavy on the guitars. And a nice little video to match as well.

(See if you can spot the Daicon homage and the video game references).