Based on the erotic game by Atelier Kaguya Team Heartbeat. God - no, such a divide in the association of health. They go on violations of prohibitions, for comprehension of a person - themselves. And in one of their clinics, they decide to conduct an experiment on the management of the human mind ... For this they hire a doctor of psychology - who has his secret ambitions about this experiment ...

Asa & Natsume are both in love with Hajime Saisho. Instead of fighting over him, they both promised to share him equally. However, both girls have to leave him by the end of the summer. As the summer days go by, they each spend their precious time with Hajime, while the day of their fated departure draws near.