Insecure and bespectacled student Karin Karino experiences the bumpy ride of first love in this touching drama set against the backdrop of typical high school life. When she becomes handsome Kiriya's object of affection, she wonders if she can truly deal with the consequences. Upon finding out that Kiriya had asked Karin to be his girlfriend, Karin's schoolmate Yuka bullies her and pushes her down a stairway to depression.

Kiriya's past slowly begins to unravel when, one night, his father takes him back to his family home and forbids him to go on the trip to Okinawa. What mystery lies behind his father's adamant wish for him not to go? And why is Karin wary of Shoko's-Kiriya's sister-in-law-presence?

Karin and Kiriya's relationship lies in jeopardy as they fight at Kiriya's school's Club Day. Kiriya's recent aloofness troubles Karin, and the word around town is that her rival Yuka went on a group date with Kiriya's class. Is Kiriya cheating on her?

Karin's overprotective father foils her plan to spend Christmas Eve with Kiriya, but the two manage to meet anyway. Kiriya gives Karin a pair of diamond earrings, but Karin's friend and confidante Nanri warns her about the earrings' symbolic meaning as a gift...

It's the proverbial teen love cha-cha - one step forward, two steps back - and they dance to the beat of their own hearts. Old-fashioned curiosity takes them to the sexual frontier, but a tiny voice in their heads holds them back. As hormones surge, passion escalates, and once all the "bases" are loaded, every parent's nightmare becomes the next big step.

Karin agrees to do another commercial shoot but is dismayed when she discovers that Shinji Takagi, Kiriya's object of jealousy, is directing the commercial. Meanwhile, Kiriya bumps into ex-girlfriend Saori Mikami at the studio, but he tells Karin he doesn't know her. The truth haunts Kiriya when Saori calls him while Karin is at his apartment. Can Karin deal with Kiriya's past?

When Kiriya's ex, Saori Mikami, shows up, Karin's insecurities get the best of her. Trying to overcome her anxiety, she decides to focus on the upcoming photography contest, but Kiriya stands her up at the photo shoot. Kiriya explains that a family emergency came up, but Karin's confidence is shattered. Now she's thinking about going to his house to make sure that he's telling the truth...

Blood proves to be thicker than water when Kiriya leaps straight into the path of danger to save his father from being hit by a speeding car. But will this selfless act be enough to mend the chasm-life right between father and son? The situation intensifies when Karin learns a secret about Kiriya's dad that she is asked to keep from he beau!

When Maho confesses her true feelings for Takashi, he admits that he's really different from her idealistic view of him. With the arrival of winter comes an end-of-semester school trip to Kyoto, where a little love and tenderness just might fill everyone with good memories and glad tidings.

Kuzuma is the yin to and his stepsister Tsubasa's yang. Their relationship is like fire and ice. Kazuma is a famous singer loved by everyone in school... and Tsubasa has a bit of a schoolgirl crush on Kazuma! But how can a girl strike a chord with someone who is occupied with his own music 24/7?

It's not easy when a stepbrother and sister are in love with each other. When Kazuma leaves the home to get over his feelings for Tsubasa, the sorrow is too much for his stepsister. Tsubasa becomes ill and is admitted into the hospital! Will Kazuma check out of the heartbreak hotel and sing a different tune? Or will everyone become stuck with the blues?

It's the end of high school, and everyone is looking toward the future - especially Soichiro Arima. He's got it going on: good grades, great body, and all the popularity! However, there is much more to Soichiro than meets the eye. This model - student is plagued by inner demons, which force him to look at Yukino in a whole new light. Will he end his relationship with his one true love?