In which episode does the magical girl Meruru appear?

The magical girl Meruru appeared in episode 1. According to relevant information, the protagonist of this cartoon is the magical girl Meruru, who has appeared since the first episode and has been appearing all the time. The first episode: girls in the fourth grade of primary school are always in a daze, and there is a carefree nature to stay in the boudoir. One night, a meteorite fell into Lumei's room, and he made a wish for it. From the broken meteorite, it appeared as a strange creature like a rabbit. With the encouragement of Cmit, Cmit and Meruru became a magical girl, Meruru, a little witch of stardust.