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[Full color 127 pages] At Seiryu Academy, where Masayoshi Negishi attends, Yuko Ayase, a teacher who had earned the trust of the students, mysteriously dies from a fall. It was ruled that her death was an accident caused by leaning on an old wire fence from the rooftop, which was supposed to be off-limits, but the four students who had been taken care of by Yuko were not convinced and decided to investigate the cause of Yuko's death. Masayoshi lives with his sister-in-law, Kizuna. He was living an ordinary day. Masayoshi is a child of a criminal who was raised like his own child by his father-in-law, who was a detective. There is no blood relation to her sister-in-law, Kizuna, but Kizuna doesn't know that. Now that both their stepfather and stepmother are dead, the death of Yuko, who took care of them like a mother, was a huge shock to Masayoshi and Kizuna. After Yuko's funeral, Masayoshi receives Yuko's notebook. The notebook contains the names of several female students and their schedules immediately before their deaths. Although the name is not written, it says after school/consultation. “It was the same with us, but Yuko-sensei was counseling troubled students...In other words, among the names in this memo are the ones who were responsible for the teacher's death, or the person who left the teacher dead. There's a chance he's there.'' The four of them exchange information in the photography club room after school.