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Takuto Kira debuted as a singer when he was twelve years old. He joined a band called Route L as a vocalist along with Keyboard player Keiichi Wakaouji and guitar player Aoi Koga. He and Aoi became very close despite their age differences and had a healthy friendship; being mean to each other often included.

Aoi was very close to his girlfriend, Hazuki ((Takuto often liked to be a bratty kid and watch them during their romantic moments to have dirt on Aoi, however, Ouji often dragged him away.)) When Hazuki got pregnant, Takuto was asked to pick a name for the baby. He chose "Mitsuki."

Two years after Takuto joined Route L, Aoi and his girlfriend Hazuki were killed in a car accident on their way to the hospital when Hazuki went into labor. Their baby survived and went to an orphanage.

After Aoi's death, Route L broke up, Ouji becoming a doctor, and Takuto going solo in his singing career.

Several years later, Ouji took Takuto to visit Mitsuki in the orphanage. Takuto felt reluctant to care for her because he felt she had taken his best friend away from him, but once he realized how much she loved singing and reminded him of Aoi, he grew to care for her.

However, darkness soon settled over the two remaining members of Route L when Takuto, during a concert, collapsed from a horrible pain in his throat. He was diagnosed with throat cancer and brought to his former bandmate, Wakaouji. Thinking for the sake of Takuto's life while he was out, Wakaouji made the decision to remove his vocal cords without his permission.

When the surgery was done and Takuto awakened to find his ability to speak or sing gone, he went into a horrible state of depression and committed suicide by throwing himself off of the roof of the hospital...