The story is about the main character, Kasuga Kaede, who recently developed a curiosity about man’s private part. She can’t get rid of the thought of it and now has grown from curiosity to a deep desire. Her childhood friend, Kobayasi, notices her change of behavior and becomes a bit worried. Even during exam, she can’t focus at all, her thoughts flooded only with chinchin, chinchin, and chinchin. Without noticing, she didn’t even answer a single question. Kobayashi was surprised with Kasuga’s zero points on exam. On other hand, Kobayashi gets a perfect score on the exam and is boasting about it. Kasuga seeing this as an opportunity. She’s up for a challenge where the loser have to fulfill one order. She studies hard everyday in order to become the winner so she could fulfill her deep curiosity.