Saint October

Saint October tells the story of a group of three girls, who work for the Kuroki Detective Agency (黒木探偵社, Kuroki Tanteisha) in Alkana City (アルカナシティ, Arukana Shiti). The story begins during a case to catch a mysterious masked kidnapper who has been kidnapping young boys for a strange man. Kotono, a member of the agency, was working hard on the case. One night after returning home late, Kotono runs into a young boy who's crying alone. With nowhere else to take him, Kotono brings him back to her home at Joshua's church where it is discovered that he has amnesia and cannot remember even his own name. While there, Natsuki Shirafuji, Kotono's friend and fellow detective, arrives to add further information to the kidnapping case. Suddenly, the masked kidnapper appears and successfully kidnaps the boy, but Kotono chases after him and gets the boy back after a short scuffle. Just when all looks lost, the boy uses a magical power to bestow to Kotono a similar power in order to defeat the kidnapper. After she won, he reveals that he remembered what his name is: Ewan. Now the focus has turned to who is the kidnapper's boss who has been pursuing Ewan.

Kotono Hayama (葉山 小十乃, Hayama Kotono) Voiced by: Azusa Kataoka

Kotono is a young, usually cheerful, girl working for the Kuroki Detective Agency. As a child, she was abandoned near a church with no memories of who she was or where she came from. The church's priest, Joshua, took her in as his own daughter. Her card is Justice and she transforms into Loli Black. Her weapon is a sword which she uses as a final attack on the enemy.

Natsuki Shirafuji (白藤 菜月, Shirafuji Natsuki) Voiced by: Yukari Fukui

Natsuki is Kotono's good friend of equal age and fellow member of the agency. She comes from a rich family. Her card is Moon and she transforms into Loli White. Her weapon is a pair of nun chucks.

Misaki Hijiri (聖 三咲, Hijiri Misaki) Voiced by: Yu Kobayashi

Misaki is a mysterious and agile girl. In the past episodes it was shown that her hometown was attacked and that she has a mission. Her card is Strength and she transforms into Loli Red. Her weapon is a bow and arrow

Joshua (ヨシュア, Yoshua) Voiced by: Yuuki Ono

Joshua is a priest who is a member of the detective agency and Kotono's foster father after she was left at his church. Despite Kotono insisting he is merely her foster father, he thinks of himself as her real father.

Kōshirō Kuroki (黒木 功士朗, Kuroki Kōshirō) Voiced by: Naru Kawamoto

Kōshirō is head of the Kuroki Detective Agency though is often bogged down by work and doesn't get much respect from his colleagues.

Ewan (ユアン, Yuan) Voiced by: Masami Suzuki

Ewan is a young boy who has amnesia. He initially gave Kotono her magical powers and the other Goth Loli.

Artista (アルティスタ, Arutisuta) Voiced by: Yumiko Hosono

Artista is a fortune teller who is also an old friend of Joshua and Kōshirō, she sometimes helps the girls out with her fortune-telling abilities.

Eddie Tsukahara (エディ塚原, Edii Tsukahara) Voiced by: Hitoshi Bifu

Kurtz (クルツ, Kurutu) Voiced by: Kenjirō Tsuda

Ash (アッシュ, Asshu) Voiced by: Takehito Koyasu

Esmeralda (エスメラルダ) Voiced by: Erika

Esmeralda is a new antagonist that appears in the middle of the series, she is the younger sister of the first antagonist Herlock.

Herlock (エルロック) Voiced by: Tsuyoshi Maeda

Originally he is the masked man who steals the boys and takes them away. He took it up as a mission but soon got bored from doing it. After he kidnaps them he keeps them in his room, allowing them to destroy the place. He works for Kurtz and, he too, had a card. His number was the "Number 1" card which gave him the Magician ability. He was the first to get judgment from Kotono and soon after was jailed. His name is considered to have come from Captain Harlock.

Richard (リチャード, Richaado) Voiced by: Takashi Matsuyama

Ryōhei Mikado (帝 猟兵, Ryōhei Mikado) Voiced by: Toshiyuki Toyonaga