Mahou Shoujo Lyrical Nanoha StrikerS OP2.

Difference between the OP2 from MGLNanoha StrikerS episode 18 and episode 23.
From ep.18:

From ep.23:

Example image:
http://i20.photobucket.com/albums/b223/Natsuki-MaiHIME/Nanoha/01copy.jpg