Schoolgirl Ayana talks excitedly about her new stepfather - a famous detective and 'hero' in local media. He is introduced to Ayana by her mother and is seen ogling her during lunch. The detective is mysterious and furtive though both Ayana and her mother seem oblivious to how dangerous he is. He has been investigating the distribution of an illegal drug, called "Yellow Star", which is a mild hallucinogen, paralyzing agent, and extraordinary aphrodisiac. Ayana brags about how big her new father is to her boyfriend, Kohei, who asks how big his gun is. The detective is revealed to be corrupt, killing a competitor on a train by placing an explosive device near him. He latterly thanks two shadowy figures who provided him with both the explosive and a supply of "yellow star".