Mystery 'Prize' and Kidnapped

                                    

                                          
At the Kobayashi Residence, a young girl is currently sleeping in her room at morning. 
                          
Her name is Kobayashi Yui aka Yuipon, a young beautiful girl who is 16 years old. She has long wavy brown that is mid-back length, her bangs was brushed to the side and black-brown eyes. She wore her pajamas which is a sleeveless white nightgown.
                          
Yuipon was having a peaceful dream until she heard her alarm clock ring when it reach 7:00.
                          
"Ugh!" Yuipon groans in annoyed as she hit her alarm clock a few times until it stop. She got up from bed and stretched her body while yawning. 
                          
She walk towards her bathroom and quickly got showered, she exited out with her school uniform which is an elbow length blue shirt with a dark blue tie and white collar, a grey skirt, white shoes with long black socks and a bangle with a heart shaped that said 'Yui'(the same uniform from Tokuyama Daigoro drama).
                          
Yuipon got her school bag and exited out of her room. She headed downstairs when her parents and her older sister, Yumi waiting for her at the kitchen.
                          
"Good morning Yui." her father said.
                          
"Mornin, sis." Yumi greeted.
                          
"Morning." Yuipon greeted back.
                          
"Breakfast is all ready, now hurry up before it gets cold."
                          
"Right." Yuipon sat down beside her older sister and the Kobayashi family started eating together.
                          
Suddenly they heard a knock on the door.
                          
"I'll get it." Yumi replied.
                          
She open the door and the mailman was there.
                          
"I have a mail for Kobayashi Yui-san, is she there?" the mailman said that had a letter for her younger sister.
                          
"Yes and I'm her older sister, I'll give it to her." Yumi grab the letter.
                          
"Thank you have a nice day." the mailman left as he go to drop off more mail.
                          
Yumi close the door and headed towards the kitchen to meet her kitchen.
                          
"Hey sis, there's a letter for you though I don't know who send it." Yumi said as she give Yuipon the letter.
                          
"For me?" Yuipon blinked as she look at the letter. She open it and read,
                          
"Dear Kobayashi Yui,
                          
Congratulations, your name was draw as the winner for a new free Mansion! This map will help you get there without a problem, please note that you can bring your family and friends too. Once again, you're the lucky person to get this prize, We hope you like it!"
                          
"EH?! I just won a mansion?!" Yuipon shouted while her family look at her with proud faces.
                          
Yuipon's mother hug her while happily said,"Isn't it great?! Now we can move from this old house to a new mansion!"
                          
"We are so proud of you Yui." her father said as she ruffled his young daughter's hair.
                          
'But I never enter a contest, who would send this to me?' Yuipon thought.
                          
After telling her family goodbye, she left to school to tell her friends about her unexpected 'prize'.
                          
-----------------
                          
At Keyaki Private Academy after class,
                          
Yuipon was sitting with her friends, which was the student council president Sugai Yuuka who long black hair with glasses, Koike aka Miichan who is the top student of the health class, Aoi who looks a grade school student and her best friend Imaizumi Yui aka Zuumin who has same bangle as her and form the Yuichanzu with her.