Heartseed initiates the body-swapping phenomenon and has himself demonstrated the ability to possess the bodies of others without resistance. He can start and end the body-swapping process; however, he allows the body-swapping to randomly choose the candidates amongst the group as it will be more interesting.

What is the Heartseed in Kokoro Connect?

Heartseed (ふうせんかずら, Fuusenkazura) is the supernatural being that is responsible for the many phenomenons the Student Cultural Society face.

Why is Yui afraid of men?

Throughout the series, Yui struggles to overcome her androphobia; a fear of men. Her androphobia was developed after she was nearly raped in junior high. Though more subtle, another one of Yui's great challenges is learning to rely on her own strength.