Gosick Episode 4: The Golden Thread Cuts Through a Passing Moment

Kujo becomes the suspect of a bizarre murder in which he witnesses a biker's head flying off. Victorique manages to quickly clear his name and guide Grevil to the real culprit. Later at the school, Kujo is introduced to Avril Bradley, a beautiful student from England who soon becomes his friend in spite of the school rumors of him being a 'reaper', but it does not take long for him to figure that there is something wrong with her.

Reference: http://en.wikipedia.org/wiki/Gosick