Kindaichi Shonen no Jikenbo: Gakuen Nanafushigi Satsujin Jiken

At Fudo High, the principal receives threatening letters from someone called the "Afterschool Magician," who warns them to stop the plans to tear down the old school building. Scary rumours of students who died in the "Seven Mysteries of Fudo High" began to spread again, and it isn't long before Kindaichi and Miyuki gets involved when the Mystery Club asks them to help investigate. When the members of the Mystery Club turns up dead one by one and Miyuki also gets attacked, Kindaichi realizes that he must solve it before anymore people are killed.
(Source: DramaWiki)
~~ 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).