Before Yoshiki Kishinuma and his friends arrived at the abandoned schoolhouse, there were the Hasegawa sisters. The older sister, Kaori Hasegawa, couldn't save her younger sister, Shiho Hasegawa, and she escaped as the sole survivor. Kaori then pledged to never forget about her beloved sister. However, Kaori couldn't tolerate those who had already forgotten about Shiho, and when she attempted to tell them about her death, no one believed her...

Before Yoshiki Kishinuma and his friends arrived at the abandoned schoolhouse, there were the Hasegawa sisters. The older sister, Kaori Hasegawa, couldn't save her younger sister, Shiho Hasegawa, and she escaped as the sole survivor. Kaori then pledged to never forget about her beloved sister. However, Kaori couldn't tolerate those who had already forgotten about Shiho, and when she attempted to tell them about her death, no one believed her...