A selfish and strong-willed 17 year old girl.

She is one of the five people who mysteriously disappeared, and a descendant of Dr. Kunihiko Aso, the creator of the Camera Obscura.

"You will return...to Rogetsu Isle..."
Guided by the words of a girl dressed in black reflected in a mirror, she heads to Rogetsu Isle with Madoka.

A timid 17 year old girl who tends to do what Misaki says.

She is worried about the change in Misaki's behavior after Tomoe Nanamura and Marie Shinomiya died one after the other.

A private detective.

When he worked with the police, he tracked down Yo Haibara, a suspect in a series of murders. When he traveled to Rogetsu Isle, he encountered the case of mysterious disappearings and found the girls.

At the request of Sayaka, with whom he had become acquainted through this incident, he sets off for Rogetsu Isle to track down Ruka.

Ruka's mother. Former last name is Yomotsuki. She is very weak and bedridden most of the time.

When she found out that her husband Soya was involved in Ruka's disappearance, she left him and moved to the main island of Japan.

They clashed on every occasion, partly because Soya had put a mask on Ruka's face.

Father of Ruka and ex-husband of Sayaka. He is a mask-maker who makes masks for the Rogetsu Kagura, a festival to comfort the dead.

He is pursuing the path of making masks, and was a strict father to Ruka when she was a child. He is obsessed with perfecting the "Mask of the Lunar Eclipse", the ultimate mask made by his ancestor, Soetsu.

A slender man with cold eyes that seem to see through everything, and the son of Shigeto Haibara.

He is a native of Rogetsu Isle, and established the Haibara Clinic in Tokyo.

He is wanted for a human experiment that turned into murder at his clinic. Kirishima, the detective who was in charge of the case, is after him.

Director of the Haibara Infirmary and an economically powerful man of Rogetsu Isle. He is also the head of the island and the priest in charge of the Rogetsu Kagura.

He has a soft spot for his son Yo, and has granted his wish to have a hospital on the mainland.

A girl dressed in black who is visible only to Misaki Aso.

She often appears in front of Misaki and asks her if she has forgotten about her.

A girl with Moonlight Syndrome.

She was admitted to the Haibara Infirmary by Shigeto Haibara, the director of the infirmary.

She has a very brutal personality and troubles the nurses with her over-the-top pranks, such as hurting others with a knife.