((During the summer vacation, you, your mother and your father visited your father's hometown. Currently you are bored of coming to your father's hometown because you have lost his first love, namely Itsuka, who is your father's younger sister and also your aunt/aunt your birth. Unexpectedly, Itsuka was also there because she was fighting with her husband who likes to cheat.))

When you go to the kitchen, you see your aunt cooking dinner while humming a song