Mimori Kosaka's dreams comes true when she's accepted to the Meidai Attached High School and gets to wear their super-fashionable uniform! She's excited about having a fun freshman year, but things don't turn out as effortlessly as she had hoped. The school year starts off well when mimori befriends the beautiful Nana, but things quickly turn sour for her when she is chosen to be the class representative. Through a series of unfortunate events, she finds herself the focus of attention of three boys and her teachers for all the wrong reasons! Mimori is reunited with Atsushi, a boy she knew in elementary school - and it turns out he despises her for allegedly bullying him in their grade school days. In fact, he plans to exact a little revenge!

In a study session in the boys classroom, Kazukita tells Nana not to act like she's his girlfriend. After Nana runs from the room, Kazukita and Ran argue over Kazukita's treatment of Nana. Frustrated, Kazukita decides not to come to school for four days. Meanwhile, Mimori gets in a fight with her mother and runs out of her house, finding herself in front of Atsushi's Mother's hair salon. While Mimori decides what to do, Atsushi's Mom drags her into the shop and has Atsushi give her a shampoo. Too embarrassed, Mimori rushes home and acidentally drops her train pass. When Atsushi, like an afterthought, presents the train pass to her, Mimori blurts out her true feelings!

Mimori Kosaka has finally become Atsushi's girlfriend! But Mimori's father announces that his company is being restructured and he will be transferred to Kyush—along with his family! While waiting for Astushi at an amusement park to break the news, Mimori collapses and is rushed to the hospital, where she awakens to the sight of...Kazukita?! When Atsushi finally arrives, will Mimori tell him that the family might be moving to Kyushu?

Mimori's in for a super-shock when her best friend, Nana, tells her she might be preggers! So Mimori does what any best friend would and goes to talk it over with the guy who might have knocked Nana up - but he doesn't' want to hear about it! Then it's time for Mimori to face up to her own boy issues as she struggles with the hard truth that she might have to move away...and break up with her brand-new boyfriend!