Yuukoku no Moriarty

Synopsis

One of William's noble students, Lucian Atwood, goes missing. William learns Lucian is dating a waitress named Frida. Dudley Bale, an administrative assistant for the university, advises William to ignore the situation. William learns from Frida's employer that Lucian had proposed marriage, despite Frida being a commoner, and she became pregnant. A man had later visited Frida and claimed Lucian no longer wanted to marry her, so Frida threw herself off a bridge and drowned. It is revealed that Dudley staged Frida's murder as a suicide then drugged and imprisoned Lucian in a brothel. William contacts two men, Sebastian Moran and Fred Porlock. Fred retrieves Lucian and places him near the bridge. Dudley rushes to retrieve Lucian only for Frida to rise from the river, terrifying Dudley into confessing to drugging Frida. William arrives and reveals Frida is Fred in disguise. He also reveals Dudley owns several brothels and opium dens and uses his noble status to lure students into them so he can blackmail their families. Sebastien fires several sniper shots at Dudley's feet, causing him to jump backwards and fall into the river where he drowns. A distraught Lucian has Frida buried in a noble cemetery.

(Source: Wikipedia)