[1] In April 1923, Chiyo Horikoshi, who had founded Wayo Sewing Girls' School, a predecessor of Wayo Women's University, established Horikoshi Girls' High School.

Students attend Meisei University and Technos International College for one day each.

If a student is unable to make up classes due to entertainment activities or other commitments, there are cases in which the school allows the student to be promoted to a higher grade or graduate without attending at all.

On November 30, 2022, the Tokyo District Court ordered Horikoshi High School to pay ¥980,000 in damages, stating that the recommendation to voluntarily withdraw without providing any educational guidance was unreasonable based on socially accepted principles.

Regarding the school policy prohibiting male–female relationships, the court judged it to be reasonable and effective in allowing students to focus on their studies.