>Mr. XX A teacher who has been chosen as a part-time sex instructor this time. His only redeeming qualities are "penis" and "extra virile". >From now on, he will have sex with all kinds of active female students >The "Sexual Guidance" begins, and "Yui" is chosen as the first female student. >Yui has a boyfriend, so she is in a complicated state of mind when she receives "Sexual Guidance". >However, she feels more pleasure from Mr. XX's "adult penis" than she could have imagined.