Before the Day

The execution of Okuma Shiori, who was convicted of a series of murders targeting teachers, is carried out. Meanwhile, Sakabe Kotaro and his two friends travel 7 years into the past, when the serial murder case was ongoing. Sakabe Kotaro and his two friends encounter Okuma Shiori, who is wanted for the murders of the teachers.
Okuma Shiori pleads with them that she didn't kill anyone. Sakabe Kotaro and his friends aren't sure whether they believe her or not, but Okuma Shiori keeps exhibiting suspicious behaviors. Meanwhile, a series of teacher murders continues unabated. Could she be the one committing the murders?
(source : mydramalist)

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