Being a pretty, lovely high school girl accompanied by personalities and expressions of puberty, Fukada often takes tangerines to her brother-in-law to be able to satisfy some of the curiosity that any young girl has experienced once in her life. But everything she does does not stop there, she is becoming more and more mature, leading to her thoughts and understanding of sexuality also growing, especially in terms of her own psychological control. She always feels curious and wants to explore sexuality, so she often takes sexy and sexually arousing her brother-in-law whenever the whole family is away. The climax is when the craze exceeds the limit, causing the boundary between you to be completely shattered, instead of an incest, clumsy love that takes place like a couple of lovers.