The mystery centers on the "suicide" of a young student named Minako three years prior. Conan realizes the current murders are acts of revenge linked to her death. It is revealed that the teachers—including the victims—had actually caused the young girl's death to protect their own reputations and careers.
Ms. Yonehara used a wig to disguise the timing of the first murder and even attacked her own student, Serena (Sonoko), to throw off suspicion. Detective Conan (Dub) Episode 85
The culprit is revealed to be , Rachel’s favorite former teacher. The mystery centers on the "suicide" of a