Seiichis younger sister. Although Hotaru was only a high school student due to Seiichis influence she too got inquisitive with the serial disappearance in Lovely Hills town. Similarly like her brother she believed that Hell Hotlines existence was a urban legend until one day she paid a visit to Takumas house regarding Hell Hotline and she met Kikuri. Kikuri brought to a faraway place where Hell Girl resided amp showed her the candles which on them were names of the people who requested the vengeance amp the victims who were sent to Hell. Being unable to find Takumas name on them she believed even more that Takuma is an innocent party.