Most of the animes I've seen are fairly old, but Dusk Maiden of Amnesia is brand new. The last episode just aired on June 24th. And I'm almost tired of saying this, but it revolves around a boy in high school. Teiichi ends up meeting a ghost, Yuko, that lives at his school and he vows to help her recover her memories. Things get complicated, as you would imagine that a relationship between a ghost and a living person would. I can't really say much more than that without some spoilers!
Even though this series was only 12 episodes, I really enjoyed it. It had a nice mix of mystery and comedy, and was very visually creative. And I apparently got pretty attached to the characters because the last episode had me teary-eyed.
I would definitely recommend this one! It's a great series if you don't want to get started on a long series and just want something quick and entertaining. And best of all, they can all be seen on Crunchyroll for free here! Enjoy!