Five students at Yamaboshi Private High School decide to form their own club, since there are no clubs that interest them. They form their own Student Cultural Society, which is primarily a social activity, which involves publishing newsletters, from time to time. The members of the club are as follows: bright and friendly Club President Iori Nagase, calm and logical, but actually a bit clumsy Vice-President Himeko 'Inaban' Inaba, selfless problem-solver Taichi Yaegashi, former karateka Yui Kiriyama, and Taichi's friend and everyone's mate Yoshifumi Aoki.
The five go together like salt and pepper and are enjoying their lives, however, one day, they start finding themselves randomly body-swapping with each other for 30 minutes at a time. They soon learn a mysterious being that calls itself Heartseed is somehow able to swap their bodies and cause the five friends many other troubles only because it finds it funny to cause them troubles and see how their relations change, depending on the problems they need to solve together.
With the course of time, the Heartseed comes up with new ideas to trouble the five friends and sometimes these ideas are a bit too 'drastic'.