Yamishibai is an anime series centered around japanese folklore. Each episode is about 4 minutes long and is animated to look like kamishibai a traditional japanese story telling method. The stories can be kind if hit or miss but the artstyle really gives it a creepy atmosphere esspecially in the first and second season.
Pumpkin Night is a slasher manga about a girl getting revenge on school bullies. It's mostly good for the gore and the deaths are pretty brutal.