Erozou is a perennial ronin student who is studying hard every day so that he can pass his entrance exams this year. However, Kaede-chan, a precocious tomboyish girl who lives nearby, comes to his way almost every day. Whenever Erozou thinks about naughty things, he forgets what he has studied, and Kaede-chan's naked body is always in his head... And today, he heard that innocent voice calling out to him again...