Isaki Tanaka, Kyojoji High School's best student, graduates in the spring. And in the summer, he kills himself. His death is the cause for Hikari Keita and Ai Nakano--the only two friends he'd ever had--to meet for the first time.

In 1977 at Miyamura Academy for Girls, Taeko Murakami (17) is found dead in front of the school--her shoes neatly placed on the roof. The only witness to this suicide is Misato Ito (15), who said once she got to the roof it was too late. Ten years later in 1987, Misato Ito (25) is working an offi...