In 1964, Momoko came by herself to Tokyo from her hometown. She met Shūzō and married him. They raised two children together, but Shūzō suddenly passes away. Momoko is dumbfounded by being alone again. She begins to go to the library and borrows books. This changes her life.
A number of children are being well fed, taken care of, and pampered at a very meticulate and managed orphanage. The facility and grounds are impressive, but the wall acting as a barrier is high. There is a secret to the place and once revealed to several orphans, they're desperate to escape.
Shuhei is leading a tough life. His alcoholic mother Akiko can only hook up with bad guys and order Shuhei to go get money from his disapproving grandparents instead of going to school. Except raising the little half-sister, his rock-bottom life seems to have no end.