Rika is known as a good person at school, almost too good, while Hibiki is more logical and does not like wasting time. One day Rika got a copy of her Family Register in order to submit to the school, she found out that she was adopted and felt in shock. Rika and Hibiki try to find out the truth and visit the address written on Family Register paper. They find an area with several townhouses built closely to each other where unique people are living…