OPs;

~Karen's OP
http://www.youtube.com/watch?v=yyK2LZk_oDc

~Tsukihi's OP
http://www.youtube.com/watch?feature=endscreen&NR=1&v=GgfE9RK36es


Prelude;

The infamous Fire Sisters consist of Karen Araragi (阿良々木 火憐) & Tsukiha Araragi (阿良々木 月火), which are present in the series of Bakemonogatari and Nisemonogatari.

Info on Characters;

~Karen Araragi

Age: 14-15
Height: 170 cm

Karen, the main character of Karen Bee, is one of Koyomi's sisters. She is older than Tsukihi and always doing outdoor activities. Despite being younger, Karen is taller than Koyomi, much to Koyomi's dismay.

In Karen Bee, her hot-headed personality and her habit of acting before thinking lead her to be stung by a bee which leads to being poisoned with a terrible fever that lasted for 3 days. Like Hitagi, she refused any help from anyone which eventually leads to her and Koyomi fighting each other. Later it was revealed that it was set up by Kaiki. Karen and Tsukihi are nicknamed Tsuga no Ki Nichū no Fire Sisters (栂の木二中のファイヤーシスターズ, lit. Fire Sisters of Tsuga no Ki 2nd Junior High). It was revealed that the reason she and Tsukihi found boyfriends was so that Koyomi would become jealous. They found boyfriends in Koyomi's image with Karen's boyfriend being shorter than her. She and Tsukihi also thought that Koyomi's girlfriend was Tsubasa. Koyomi, Karen and Tsukihi's parents were revealed to be police officers.

~Tsuki Araragi

Age: 13-14
Height: 156 cm

Tsukihi, the main character of Tsukihi Phoenix, is one of Koyomi's sisters. She's the youngest of Araragi family. Unlike her sister, Karen, she is always doing indoor activities. Contrary to her personality, she constantly changes her hair style and is short-tempered to the point that Koyomi describes her as having hysteria.

She is actually the reincarnation of a phoenix and has been since before she was even born. The phoenix entered the baby's body when it was still in the womb and by now both beings' minds have become one. She is immortal and the only thing that end her life is a natural death from old age. It was hinted that Kaiki was the one who sent Kagenui and Ononoki to go after Tsukihi. Tsukihi and Karen are nicknamed Tsuga no Ki Nichū no Fire Sisters (栂の木二中のファイヤーシスターズ?). It was revealed that the reason she and Karen found boyfriends was so that Koyomi would become jealous. They found boyfriends in Koyomi's image with Tsukihi's boyfriend being taller than her. She and Karen also thought that Koyomi's girlfriend was Tsubasa. Koyomi, Karen and Tsukihi's parents were revealed to be police officers.