Nami Kikkawa

Kenji has a hard time being intimate with his girlfriend Noriko partially because he fears he has an STD. In order to get tested, Kenji is hired by his mother to spy on his father to see if he is still cheating on her. He is, and his father's girlfriend actually starts working for the family.

Hikari's boyfriend is one of those killed in the Akihabara massacre incident. Suffering from the shock of her loss and unable to accept this reality, she cuts herself off from the outside world. She eventually manages to muster enough courage to visit Akihabara, the scene of the incident. There, she encounters many people who are still coming to terms with the aftermath of the incident and are still suffering from the aftereffects. (Wikipedia)

One day, Nozomi Kuroda finds a love letter in her desk from the most popular boy at school, Jun Setoyama. Though embarrassed and puzzled, a secret exchange diary between the two begins when she puts her reply in the shoebox.