Grisaia no Kajitsu Spinout!: Idol Mahou Shoujo ChiruChiru Michiru

Matsushima Michiru is an unpopular Idol whose dream is to someday become as famous as the admired idol, Kazami Kazuki.

One night, while looking up to the sky, she saw a falling star and wished upon it to quickly become a top idol. However, the falling star turned out to be the familiar cat Nyanmel, who came from a magical world, and in order to save the world, he told Michiru that she would have to become a magical girl.