Disclaimer: Nothing's mine but the plot!

A/N: This is my first Marimite fanfiction so please tell me what you think and review! Gracias and enjoy! =D

Prologue

Yumi arrived home to find a red convertible parked in front of her house and sighed, moving forward tentatively since she didn't know what to expect from her visitor.

"Wha...?"

"Hello, Yumi-chan!" Kashiwagi Suguru greeted her, waving and wearing a charming smile. From behind him, Yumi's younger brother Yuuki was attempting to escape unnoticed.

"Ah, good day, Kashiwagi-san...not to be rude, but..."

"Ah, I couldn't resist seeing Yuukichi home," Suguru replied, saving Yumi from the immanent rudeness of her question. "The bus is rather awful, isn't it? Surely my dear Sa-chan does not approve either."

"Ano..." Yumi stuttered at the mention of her beautiful onee-sama's name. Even the thought of Ogasawara Sachiko could halt Yumi's breathing and the look in the heiress's eyes when she gazed down at Yumi was enough to stop her overactive heart. She didn't know when it had become more than sisterly love or if it had ever been less regarding her onee-sama, but Yumi wasn't lovesick enough to believe that she ever had a chance with the elegant, raven-haired goddess.

Then Yumi blushed, realizing that she still hadn't replied to her onee-sama's cousin...her fiance. Luckily, Suguru wasn't waiting for a reply as he teased Yuuki, whose face was almost as expressive as Yumi's. Really, it would be easy to hate a person like Kashiwagi-san, but being Yumi, it was almost impossible to hate anyone, even the man who would steal her onee-sama away.

"Y-Yumi!" Yuuki suddenly burst out, "I forgot that mom had to talk to us about...the..the thing! Let's go!" Darting out of the flamboyant heir's grasp, Yuuki yanked his sister into the house. Once he had slammed the door with a hasty goodbye to his sempai, he slid down against the wall, panting. "I don't know what I'd do if we had a similar system in our school as you do with the souer-system," he muttered, imagining Kashiwagi in all his feminine splendor as his 'onii-sama'. He shuddered.

Yumi bit her lip, half afraid for her little brother and half entertained as she had seen Kashiwagi-san at his most flamboyant.

"What's going on out here?" Yumi's mother asked from the kitchen as she leaned out into the hallway.

"Nothing!" the two siblings yelled simultaneously.

"Oh, good, because I have a surprise for the two of you," Mrs. Fukusawa said as she stepped into the hallway. She was pulling along a tall, pretty girl with long, wavy brown hair and bangs that fell across her forehead to the right.

The girl waved with a bashful smile. For a moment, neither Yumi nor Yuuki spoke and then...

"Onee-chan!" Yumi cried as she launched herself into the other girl's arms.