Kenichiro Matsushima works for a mid-sized construction company Frontier Construction. Until recently, an apartment was built here, but it was demolished by the remodeling of Kenichiro's company. One night, Kenichiro went to the scene to attend a party with his colleague Shiro Kumazawa. Kumazawa is worried about the drinking party with Yoshino Machida, who is waiting for the party, and feels uncomfortable. Narumi, who began to suffer from abdominal pain, was rushed to the hospital, but he ate too much. The next day, Narumi visited Kenichiro and went to his office. He seems to have found her whereabouts at the address of the invitation.
