Kanna Nozaki's Erotic Troubles ~Case Closed with sex!~

As the Student Council President, Kanna Nozaki was conducting her duty of surveilling Yariman High School. One day, Kanna was notified of theft. A female student had her underwear stolen. Kanna immediately formed a task force to further investigate the case. Kanna usually mugs or performs erotic attacks to collect hints. Kanna thereby identifies the criminal. The criminal's peculiar motivation was...!?