"Kōkō Debut: Kōkō no Kōkō" is a Japanese manga series written and illustrated by Kazune Kawahara. It follows the story of Haruna Nagashiro, a high school girl who is determined to find love. To achieve this, she enlists the help of Yūna, a popular boy at her school, to teach her how to attract a boyfriend. The series explores themes of friendship, romance, and personal growth as Haruna navigates the challenges of high school life. It combines humor and heartfelt moments, making it relatable to readers who have experienced the ups and downs of adolescence.