Haruma Kawagoe is an only child. A long time ago, at Christmastime, his mother miscarried the child that was to have been his baby sister. That night, young Haruma knelt down and offered up an earnest prayer: "Please make my mother well again, and please give me a little sister." Years have passed, and Haruma has nearly forgotten his prayer. But Santa hasn't.... one Christmas, when Haruma is least expecting it, he gets an unusual present - his sister. (Source:Anime News Network)

Though it was a bit strange, three people ended up meeting. One, who looks younger than her age and able to see the supernatural. Another who is possessed by a "Yamanko" which refers to "Yama no ko", or a mountain child. She was possessed due to her bloodline and due to the possession, she has superhuman abilities which she can call upon. Finally, an awkward person who enjoys writing poems.

Have you ever lost anything that was so precious to you, that if it were gone you wouldn't know what to do? For Otokawa Natsuru, that item is a keychain. Hearing from Kazama Miori, a fellow student with renowned psychic powers, that taking something precious can help with relationships, Natsuru takes her keychain on a date with childhood friend Yanagi Eitaro. But somewhere along the date, her precious keychain is lost...

Tsuchie Takeshi has dreams of playing with Hikari-chan as a child. He remembers her as a kind, sweet girl. However, one day on the way home from school, Takeshi is abducted and taken to a huge house, only to find out that she's become an arrogant, violent dominatrix. Furthermore, she says that he promised to marry her! How will he adjust to her new personality, and living with her as a new son of her prestigious family?

Some memories of Kei & Mizuho

The magical girls academy has 6 new students transferring into their school this year一Pam, Chris, Sarah, Fran, Liz and Chell. Their new and exciting, heart throbbing school life has only just begun! (Translated and adapted from the official Kodansha entry: http://kc.kodansha.co.jp/title?code=1000002519)