Average, unremarkable Ai Maekawa navigates school life unnoticed...until one day when a spiteful classmate totally humiliates her in front of everyone. Determined to jettison her embarrassing past, she overhauls her image and enrolls at a new high school where no one knows the old Ai. From the start, Ai is the target of romantic advances and jeolous gossip—can a formerly invisible girl handle this avalanche of attention? And is Ai's erstwhile identity as a loser really as far behind her as she hopes?

Ugly duckling Ai has blossomed into a swan, but looks are only skin deep. Will Ai's inner confidence catch up with her outer beauty so she can overcome here Doubt ? Just as Ai begins to feel secure in her budding relationship with Sô, she hears a rumor that Sô isn't solely devoted to her. She doesn't want to believe it, but when one of Sô's other girlfriends—a beautiful, elegant college student named Kyoka—arrives on the scene, Ai can no longer avoid the truth and is thrown into a tailspin of confusion. Was it naive of Ai to think that Sô could only have eyes for her? Is she ready to swallow her pride and compete with Kyoka for Sô's attention? Or will she decide that no guy—not even Sô—is worth the hassle and humiliation of sharing him with other women?

As Ai begins her second year of high school, the influx of pretty freshman girls means fiercer competition for her boyfriend Sô's heart. The rising tension magnifies Ai's insecurities, and she lashes out at the new students! Could her tantrum make her the school's laughingstock again? Meanwhile, when Sô learns that another suitor is pursuing Ai, cracks in his usually cool demeanor expose a nasty jealous streak. But even if Ai can forgive Sô's boorish behavior, the lovebirds won't be out of jeopardy because a mysterious interloper is determined to break them up!

Ugly duckling Ai has blossomed into a swan, but looks are only skin deep. Will Ai's inner confidence catch up with her outer beauty so she can overcome here Doubt ? Ai's sometimes-rocky relationship with her boyfriend Sô has weathered many a storm and become stronger for it...but now that Sô's first serious girlfriend, Shuko, has come back into the picture, it may be a different story. Sô and Shuko have a history together, and Ai's confidence wavers when she realizes what a comparatively short time she has been a part of Sô's life. When Sô returns to the arms of his ex, will Ai put on a brave face and accept his decision, or will she push her hard-earned self-respect aside and beg to get him back? Find out in the poignant conclusion of DOUBT!!