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Azusa Noyama is a 12-year-old girl student, taking 5th grade, but everyone knows her as Azuki-Chan, nickname that she dislikes. Yuunosuke Ogasawara, a new student, asks her about her nickname, saying that he likes it. Azuki falls in love with him, and they start going out together. They share a diary, and become boyfriend and girlfriend.
Valentine's Day is approaching and Azuki and Kaoru have their minds full with getting gifts for Yuunosuke and Ken.
When his mother's untimely death quickly follows his father's, a doctor begins to believe a killer may be targeting him and his amnesiac wife.
