Onna keibi-in: Masaguri junkai

Makino Kaori and Katahira Yuki work for a security company. Yuki is fond of Kaori, who is pure-hearted and devoted to her training. One day, at Yuki's suggestion, Kaori decides to take building security training. There is a rumor that a certain room in the building is haunted by the ghost of an office lady who died in an accident...