Akane Iro ni Somaru Saka Hardcore OVA

Junichi Nagase sets off with his classmates for a private island owned by the influential Karen Ayanokouji, hoping to spend some time away from his usual surroundings and schoolwork. The trip is planned as a vacation with fun on the beach, walks and relaxed time together. But things begin to change after Karen brings along an experimental tanning lotion whose properties have never been tested under ordinary conditions.

Using the lotion has unexpected effects on the girls' behavior and appearance, setting off a chain of unusual situations. Junichi ends up at the center of it all, trying to keep his composure and avoid the conflicts caused by the changes the substance brings about. The girls on the trip become unpredictable, ruining the original plans and creating new circumstances that demand a response: some begin to experience unfamiliar sensations, while others show sudden shifts in personality, which affects how the whole group gets along.