HEART COMPLEX is a handmade set in the fictional Fuyukibo High School, located somewhere in 2000s Japan. Sumire, has her life turned down after she changes school on her senior highschool year. Her plan is to finally fit in as a normal girl on her new school, the obstacle being everyone.
Heart complex only covers a year of the complex universe, which means it sets only on 2008.

Grey complex contains mature themes such as suicide, mental health talk, and more.