Going to leave this here, hope you will do something for the storyboard:
Log
00:15 *Gabe is editing [http://osu.ppy.sh/b/264643 ClariS - Songs Compilation [Marathon]]
00:15 Gabe: what if you add a black background behind those backgrounds?
00:16 Gabe: when the first background fades, we can obviously see the initial background before the second one appears