Kawase Kohei, the producer of Geneon Universal Entertainment, posted in his twitter that the episode 4 of Mayoi Neko Overrun!
was completed at 8pm on April 20th, JST, only one week before the airing.
According to Presepe news, the director of Mayoi Neko is switched in every episode and there is no general director who oversees the whole series. It's an unprecedented production scheme.
Sources: Kawase's tweet