Description: The four main characters Aya, Rina, Saki, and Yuka invite you into the world of human relationships. You will learn what socially correct behavior is and how best to behave so as not to make others inconvenience you. This subject is studied as a separate major in universities, but at the same time sociology is an applied science necessary for all people living in the modern world. Standards of behavior and attitudes vary from country to country, but there are some common ones. You will also learn about the Japanese New Year's custom of otoshidama and why the Japanese throw a 5 yen coin into the temple, learn to control your emotions and distinguish between rational, irrational and affective actions. But human is not a machine, and their actions cannot be so easily categorized.DMK Press, translated