lit., "Hearts Connect") is a Japanese light novel series written by Sadanatsu Anda, with illustrations by Shiromizakana. The series includes 11 volumes published by Enterbrain between January 2010 and March 2013. Two manga adaptations have been published by Enterbrain and Kadokawa Shoten. A 13-episode anime adaptation directed by Shin'ya Kawatsura, written by Fumihiko Shimo, and produced by Silver Link aired in Japan between July and September 2012. Four additional episodes aired on December 30, 2012.The story involves five high school students—Taichi, Iori, Himeko, Yoshifumi, and Yui—who are all members of the Student Cultural Research Club. One day, they begin experiencing a phenomenon in which they randomly swap bodies amongst themselves. As these five friends face many different phenomena at the whims of a mysterious being known as "Heartseed", their friendship is put to the ultimate test.