25-sai Shojo 7-sai Toshishita no Danshi Koukousei to Dousei simasu

Haruka, or Torako Harukawa, is a popular, charismatic columnist known for her advice on relationships. Though the truth of the matter is that she's completely inexperienced. She's never been in a relationship, let alone kiss or even hug a guy.
One day, she receives an offer to write a real-life romance novel on intimate relationships.

Adult-oriented...? Steamy...? Passionate...?
She can't think anymore.

Haruka goes to a bar, drinks too much, tells her problems to the bartender, and gets smashed...

She wakes up the next morning to find the bartender sitting in her home...!
It's then that he tells her that he's a high school student!!

Will Haruka start learning about adult intimacy from this young guy?
The 25-year-old who's still innocent and the high school senior are about to start a secret life together under a single roof!!