Shigeta, a 24-year-old woman, works at Tanaka Books and is preoccupied with finding love. However, she faces challenges in forming relationships due to her own flaws. Specifically, she struggles with making good judgments about men and has low self-esteem, which exacerbates these issues.
Happy Mania was published in English by Tokyopop from April 15, 2003 to December 7, 2004.