Primary Colour High School Girl Pink Picture Book (1990)

In this garden of girls, a rumor spreads about an aphrodisiac that turns any high school girl into a nymphomaniac with just one dose. Soon, victims start to fall prey to this toxic bite. There is no time to waste. Through the pursuit of the Peach-Colored Detective Club, the culprit is revealed to be someone within the school. Now, the mysterious figure, Masked Villain YAOYA Melon, has shown their true identity, and the fierce battle with the Detective Club begins!