Therapy no Kanojo - Josei Fuuzoku kara Hajimaru Kankei

The story is about the main character, Saya Ando, who witnesses her boyfriend, Ryo, entering a love hotel with another woman.
After that, the main character is told that her boyfriend broke up with her, and in her heartbreak, she makes a reservation at a "women's sex club" and meets Aki, a therapist who becomes her therapist.