Full Metal Panic! (2002)

S2E5 The Pure Yet Impure Grappler / Trespassing on Good Faith

Sousuke and Kaname delve into strange occurrences involving a masked assailant who targets schoolgirls, giving them ponytails as a signature. Teaming up with a local police officer, they devise a plan to ensnare the culprit, using Kaname as bait. In an effort to show the emotionless Sousuke what fear feels like, Kaname brings him to an eerie, abandoned hospital. Surprisingly, she ends up more frightened than he is. They discover that the tales of the haunted hospital were actually spread by a mother and son living there, who simply desired some tranquility.