Kurama Ranko (鞍馬 蘭子, Kurama Ranko; "Ranko Kurama") is the leader of the Kurama-gumi, an illegal casino owner and member of Kakerou. Leo and Hyougo are her two most trusted subordinates. 

She has an unforgiving personality and is disgusted by people like Kokonoe Tarou. She hates people that kill children and women and deems them as inhuman. A very clever and cunning individual who rose through Japan's underground with her Kurama-gumi, Ranko is often compared with a snake regarding the way she treats her enemies, allies and associates.