Love the way the mangaka is able to make multiple stories,and have them tie in together.IMHO,It's something someone would do if they knew their story had glaring plot holes or they've planned ahead to do spin-offs,and have it all tie in.I'm not sure where Mahou Shoujo of The End ties into the main story,just yet[Not sure if anyone knows,really].At least this spin-off was a fun ride,although it was very short,but still a fun ride!