High school student Yuki Hase wants to become close with classmate Kaori Fujimiya who is alway by herself. Kaori Fujimiya refuses to become close with Yuki Hase, because she forgets her friends every new Monday. Even though Kaori tells Yuki why she doesn't want to become friends, Yuki still wants to become close to her.

One Week Friends

Restaurant owner Kenji Nagata has been stabbed to death. When the police begin an investigation, a bag of human bones is discovered in Nagata's car and Detective Kajikawa asks anthropologist Kumiko Misaki to perform an examination. She discovers that the deceased was a man in his mid-twenties and that he died more than 15 years ago. Meanwhile, suspicion for Nagata's murder falls on his apprentice chef Ryohei Miyamura due to the murder weapon being a kitchen knife. Afterwards, Miyamura breaks into Kumiko's lab, but manages to escape...