Yokuwakaru Gendaimahou Episode 00

Bandai Channel streams episode 00 of "Yokuwakaru Gendaimahou" from June 29th till July 6th for free. It's an extra episode titled "cruncha cruncha cruncha", which happens in the middle of the TV series.
The episode was first shown at a joint event of Gendai Mahou and Hatsukoi Limited held on June 14th.

Source: Gendai Mahou Official Website
I apologize for the delayed post. I forgot this episode.