This is the second installment of the reverse shota project "Maseo" series. This time, the main character Maseo comes to stay at his homeroom teacher Yoko's (Lucia Todo) house for three days during the summer vacation. Yoko, who has been giving Maseo a hard time, plans to get to know him better and educate him during the summer vacation. He lives with Yoko's husband and her younger sister Shiho at her house. Maseo has always wanted to touch Yoko's huge breasts, so he touches them behind Yoko's husband's back and takes a bath with her. Then he has Yusuke, who is the same age as him, play with his sister Shiho's huge breasts, and does whatever he wants!