16 year-old Luna is a first-year student at Angelica High School, run by Catholic nuns. Luna's a cute girl, but she gets in trouble a lot for her behavior. For example, during church services, she hid in the back asleep and drooling instead of paying attention.

After one such bout of bad behavior, Luna is punished by having to clean the church. As she does, she pauses to examine a beautiful piece of art on one of the walls. It's like a stone carving where a man's body is coming halfway out...

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Michiru is Akira Tennouzu's number one fan until her mother remarries and he turns out to be her stepbrother...

Yukako no Dream Theater series vol.1.

From Vampire Knight:
Ai was your normal, everyday grade teenage girl until one day, she was involved in a fatal car accident. In the hands of the Specialized Secret Police Organization, she was able to be revived. With her newly gained powers acquired through the operation, she becomes a defender of justice. With the mysterious (and a little perverted) bishounen Sagiriya Shinogu as her partner, she fights the forces of evil!

The main character is a girl who everyone mistakes for a highly experienced flirt as she gives the most advice to girls on their relationship problems (and because of her cute looks) The truth is, she's no more than a whimpy novice who hasn't even experienced her first kiss yet! (Credit for her advice goes to teen magazines and much research) Her pent-out frustrations were overheard by the school's most outrageous flirt and those two strike up a deal for her to take up lessons to advance in experience...!

Part of a collection (fourth story) of a larger volume of itself, Vampire☆Vampire.

[From ShoujoMagic]:

15-year-old Hina is about to share her first kiss with her boyfriend Natuki and all of a sudden he transforms into... a vampire named Hibiki!?

Cute and child-like high schooler Suzu has an affinity with animals. She wasn't aware of just how much so until the day a large black cat literally falls into her arms! She wakes up after taking the injured cat home to treat its wounds, and finds a naked boy, "Noa" in her bedroom! He claims to be the cat, "Noir".

It appears that someone is after Noir as they are suddenly attacked by cats. Suzu can sense they are being controlled against their will. After their escape Noir/Noa is impressed by her bravery and the fact that she can understand animals--so much so that he asks her to have his babies!

Poor Suzu, what is she to do with this cat-boy who's determined to stay close to her, VERY close? And what of those who are just as determined to get Noir back?