Takuto's Relationships
Mitsuki
After refusing her throat operation, Kouyama Mitsuki encountered a Shinigami named Kira Takuto, whom was supposed to stop someone from preventing her death. Takuto takes pity on Mitsuki, realizing that she, like he at one time, couldnt live without singing [though at the time, this was subconscious]. Takuto gave Mitsuki his blood, which enabled her to become her 16 year old self FullMoon. He was originally going to do this to grant a last wish, but after hearing her sing, Takuto decided that he was in love with Mitsuki, and wanted to protect her . When he found out that Mitsuki was singing for Eichi-kun, he became very jealous and began to peruse her more forcefully. This all really started after Mitsuki passed out due to overexhaustion.Takuto gave her mouth to mouth, though she didnt know.
Later, Mitsuki presents a gift to Takuto, a cute Neko outfit. She is laughing and telling him how lucky she is that he is there,when he is overcome with lust and pulls her near. He thinks I want to hold you tight
After Takuto finds out that Eichi is really dead, he takes his obsession with Mitsuki head on. He tells Mitsuki that he loves her. Mitsuki becomes very upset, and starts yelling at him, where he then Tells Mitsuki she is alive and needs to move on [Ironically, he is dead himself >>) Takuto and Mitsuki share an embrace, and against her obvious wishes, Takuto still proceeds to win her over Eichi.
Takuto soon meets his old girlfriend, Hikari again. Mitsuki cannot stand that Takuto is giving his attention to someone else, and she falls into despair. Takuto soon realizes this, dumps Hikari, and runs to her aid. Mitsuki tells Takuto she is scared, because she wants o be devoted to Eichi, but Takuto says she doesnt need to give Eichi up. They share a kiss.
In the end, Mitsuki chooses Eichi during the final battle with Sheldan
Flash forward 4 years. Mitsuki is 16 and still alive thanks to Takuto making her FullMoon so much. Mitsuki sees him.. alive. She tells him she loves him(WTF)?
Izumi
Takuto and Izumi have a strange relationship. It is theorized that Takuto is sore at Izumi for taking Meroko away, as he still belives that she loves Izumi, though she really does love him. For whatever it may be, Takuto and Izumi costantly fight, and he is very uncomfortable with having him around. Once they shinigami realize that Eichi is dead, the boys seem to respect eachothers feelings, and Takutos bitterness is shown much less(however, in the anime, they seem to hate eachother though the whole series). Some hardcore Yaoi fans spectate that Izumi has a crush on Takuto, due to the kiss he gives him in volume 3. I highly doubt this.
Madoka
Takuto and Madoka never meet, but she constantly stresses him out. When Izumi gave Madoka FullMoons lyrics, Takuto was furious. He seems to dislike strong personallitys like Madokas, and suggests that he dislikes her several times (specifically, in the anime)
Hikari
Takuto was Hikaris biggest fan back when he was still alive. Though he was with Route L , and clearly famous, he was humble and innocent about his feelings for her. At the time, Hikari was really only interested in press coverage, and the two entered a relationship. Takuto had real feelings for her, but of course, she was playing him for a fool. Once Takuto died, she realized in the time they spend together, that she loved him after all. For that long, she never stopped loving him. As fate would have it, one day, after Takutos death, she saw him as a human, and felt an instant conection. The two oce again became involved, though this time, she did not know it was Takuto. She told him that she prefered him over Takuto (showing his growth). Takuto knew he was lying to himself, so he broke it off with Hikari, ad she gracefully accepted that. When he is reborn, She also gracefully accepts that he is with Mitsuki.
Ooshige
Takuto and Ooshige only seem to formally meet in the anime, though they dont really speak, because Ooshige cannot see him. Otherwise, one would assume that Takuto at least KNEW of her from their days as singers, since she liked his close friend Wakaouji.
Eichi
Eichi was Takutos first assignment. He threw Eichis soul away, though Eichi wanted to live for Mitsuki. Takuto had always been haunted by the young boys eyes. Takuto is very jealous of Eichi, and badmouths him to Mitsuki, saying that he probably forgot all about her. Later on, he thinks more and more about what Eichi would do. Takuto has strange respect for Eichi, but doesnt seem to respect him enough to let him and Mitsuki be together.