Naohiro is the yandere twin brother of the listener of Yandere Heaven volume 3.
Background[]
Naohiro has always been close to his sister. Ever since their mother passed away, he's always been looking after her. According to some dialogue, he and his sister attend the same school as Kakeru and Atsushi.
Yandere Traits[]
Naohiro believes that because he and the listener are twins that they have a closer relationship than anyone could hope to achieve with her. He constantly talks about his thoughts "reaching" her and that only he is capable of understanding him as he is with her. During his ending, he believes that because they are twins, his sister loves him like he loves her. He remembers that his sister is afraid of storms and is willing to stay with her until she feels at ease. Because of what happened to their mother, Naohiro is willing to protect his sister at all costs, even from their stepfather whom he is aware has feelings for her. He's overly hopeful that he and his sister will always be together. To express his devotion to his sister, he grew his hair out and plans to cut it once they get together. According to Hajime, Naohiro hoped to use a school field trip so that he could be alone with his sister. He gets quite jealous of his stepfather being near his sister and is jealous of other men at school being near her. When Hajime takes her on a trip to the sea, Naohiro becomes scared that something will happen to her and tries to convince her to get out of his car. He also sends several angry texts to Hajime stating that he won't give his sister to him and saying that he will never forgive his stepfather if he did anything to her. He also blames Hajime for their mother dying and believes that he's better off dead so that he can't take away his sister. He also believes that Hajime's trip to the sea with the listener was him trying to commit a double suicide with her. During his ending, he locks up the listener up and presumably destroyed the house that they were living in before. He refuses to let the listener outside because he fears that she will pay attention to other people except him. When he suspects that the listener doesn't love him, he threatens to commit a murder-suicide. While he claimed it was a joke at first, he intends to keep it if she were to betray him in some way.