Kindaichi Shonen no Jikenbo: Gokumon Juku Satsujin Jiken

Hajime finds it difficult to graduate to the next grade at school. His friend Miyuki tells Hajime to study at a private school which is famous for its strictness. At that school, Hajime uncovers a death caused by non-natural reasons. He's challenged by a genius crime producer.
(Source: AsianWiki)
~~ Adapted from the manga series "The Kindaichi Case Files" (金田一少年の事件簿) written by Kanari Yozaburo (金成陽三郎) and Amagi Seimaru (天樹征丸), and illustrated by Sato Fumiya (さとうふみや).