From Shoujo Crusade:
Because of his much-too-strict character, the excellent and capable student council president, Hayami Reiichirou was isolated from his surroundings. But, one day, he is forced to take care of a kitten he received from his mother who is in the middle of divorce. Seeking help from the resident cat-lover in the student council, Shiraishi Kotoko, there is...!?

Also contains, Gakuran Ouji.

From Omari's Sister:
Uptight Student Council President Reiichiro Hayami gets dragged into taking care of a kitten. How will the adorable kitten, Ku, change Reiichiro's life?

[From Baka-Updates:]

Minami does not get along with her fellow classmates. She is rich and full of pride, yet lonely with no friends. Her luck changes when the "rude and idiotic" Tomachi starts hanging around with her. One day, she sees a book and tells Tomachi, "Wonderland... wouldn't it be wonderful if we went?" Tomachi's answer and reaction surprises her as both go on a crazy journey... meeting all sorts of people and walking cards... Follow their journey down the rabbit hole...

Katsuragi Kiyo inherits a mansion AND vampires from a grandmother she never met. How does her life change after her so called fortune?

This manga also contains an extra story in both volume 1 and 2:

? Angel Koiuta (Angel Love Song)
Mizuho is a young girl who just had an argument with her boyfriend, Kei-chan. On the way home, she met a fallen guy from the greenhouse along with a guitar who called himself Tenshi. Mizuho took him home and asked him to form a group for the competition to win a cruise dinner so she could make up with Kei-chan. So will Mizuho get back together with her boyfriend or will something else spark?
This story was released as a oneshot in the furoku book Glittering X-Mas Story 2003.

? Kyuuketsuki no Onegai (Please Mr. Vampire)
Miku heard that there is a place where you can ask to become beautiful. She wants to be beautiful to be able go to the dance with a boy she likes. However when she goes to this place it turns out that the person who can make her beautiful is a vampire and needs to drink her blood to do so. What will she do.....

Kurai Karen is a rich ojou-sama with many suitors. She's in love with her butler, Ishibashi Megumi. Long ago, the two of them made a promise to be together forever. Now that they've grown up, Megumi seems to have forgotten, but Karen hasn't. A forbidden love between master and servant, what will happen to them?!

Minami does not get along with her fellow classmates. She is rich and full of pride, yet lonely with no friends. Her luck changes when the "rude and idiotic" Tomachi starts hanging around with her. One day, she sees a book and tells Tomachi, "Wonderland... wouldn't it be wonderful if we went?" Tomachi's answer and reaction surprises her as both go on a crazy journey... meeting all sorts of people and walking cards... Follow their journey down the rabbit hole...

Izumi suddenly finds a 10 yen coin she swore she had lost in a cabinet that wouldn’t open before. Soon after, strange things start happening and she enlists the help of their school counselor who also takes care of matters of the supernatural. But then, she finds even he wasn’t as he seemed…
(Souce: MU)

Kiyomi has secretly been using the prince of her school, Narumi-kun, as a model for her manga 'Gakuran Ouji'.

Why is this? Because of how elegant and perfect Gakuran looks on him of course!! Even Narumi-kun is unaware of his use of image in Kiyomi's manga until one day Kiyomi accidently falls and drops her drawn images infront of him...