Luna Child no Saishuu Bouei Line

A doujin game by ENAMEL SWORD based on the Touhou Project series. The year is 20XX, spring. Sunny says, "Hey! I'm getting a lot of hairballs!" Star "I can't even play a smart prank with this..." Luna "It can't be helped... I'll take off my skin and clean it up!" And so it came to pass that she had to exterminate the furballs that had grown in large numbers. What is the fate of the three fairies of light?