From Kokoro no Oasis:

It’s about 16 year old orphan Sakiko Amamiya and a dying cherry blossom tree that her grandmother left to her to look after. Of course, that includes looking after Shizuya, the spirit that lives within it as well…

From Starry Heaven:

Amamiya Nonoka is a human that can see spirits. Because of the strange ability she posseses, she has no friends at school at all. Suddenly, one day two handsome brothers appear in front of the lonely Nonoka. Aki and Kou, the two of them came to borrow Nonoka's "strange ability"? Not to mention, they are renting parts of their bodies to continue living...

From Sweet Indulgent:

Hana is a normal teenager who goes to school normally, that is until she gets run over by a car... or did she? Suddenly, she finds herself in a weird place known as the "Red Light District"... in EDO PERIOD?! Trying to find a way to get back to her own time, she somehow gets mistaken for a prostitute and has to escape. Not expecting to be saved by a gentleman, she suddenly ends up in a geisha house.. but then she is bought by the same guy who helped her earlier?!