Biography
Reimi Sugimoto is a 16-year-old teenage girl who lives in Morioh. She is petit and pretty with brown hair and violet eyes (blue in the manga). In her appearances, she is wearing a short sleeveless dress, a choker, and a hairband. She is also usually seen with her dog Arnold. Reimi is seen to be a kind, jovial, and playful girl with a strong sense of justice.
History
Reimi was the babysitter for Kishibe Rohan when he was four years old. One night when she was babysitting him while his parents were away, Yoshikage Kira entered the house to attempt to kill Reimi. After being awoken by a dripping sound that was revealed to be the blood from Arnold’s corpse, she quickly saved Rohan by allowing him to escape from the window. This, however led to her being murdered by Kira.
Since then, she has lived as a ghost, stuck in her 16-year-old form, bound to a phantom alley with her dog Arnold, awaiting someone to hear their story and help to bring Yoshikage Kira to justice.
Diamond is Unbreakable
When Koichi Hirose and an adult Kishibe Rohan stumbles into the phantom alley 16 years later, she initially teases them for a bit but eventually reveals her past to them, hoping that they would be able to stop Yoshikage Kira and apprehend him before he continues to murder more young girls. She then continues to stay in the alley, seeing the spirits of anyone who died at Kira’s hands, including Shigekiyo Yangu.
At the end of the season, when Kira is finally killed, his spirit ends up in the alley. Reimi tries to trick him into looking back but is unsuccessful. Arnold manages to achieve it however by biting his hand, and he is dragged into the abyss alongside with Stand. With this, Reimi is finally able to rest in peace as she goes into heaven while bidding farewell to the heroes in Morioh.