S1E521 — Murderer, Shinichi Kudo
Case Closed — Season 1, Episode 521.
Heiji takes Kazuha, Kogoro, Ran, and Conan to East Okuho after receiving a letter from Makato Okuda addressed to Shinichi; The letter tells Shinichi to meet with him so he could explain Shinichi's deduction mistake from his past investigation.
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