Akai Ito is Japanese television drama series based on a popular mobile phone novel written by Mei about two soulmates - junior high school students Mei and Atsushi - who must overcome drugs, rape and attempted suicide in order to be together. The love story was an online hit in 2006 and later published as a series of five books which sold 1.8 million copies.

A 15-year-old girl forced into police protection to escape from the journalistic hordes after her brother is arrested for murder.

After detective Natsumi Yukihira brings an end to the police hospital terrorist case, Natsumi is transferred to the Nishimonbetsu Police Station in Hokkaido. Meanwhile, a series of grotesque murders occurs in downtown Tokyo involving nails placed in the body of the victims. The fingerprint of Natsumi's ex-husband, freelancer journalist Kazuo Sato, is found on the the body of a victim and Kazuo is placed on the most wanted list. Soon after, Kazuo finds Natsumi and hands her a USB memory stick. The device contains information on a secret organization within the police department. Kazuo tells Natsumi that the series of murders are warnings and suspects become the next victims. Natsumi is then arrested as a suspect. Tokyo prosecutor Katsuaki Murakami appears at the Nishimonbetsu Police Station to investigate.

The story follows Akane, a girl with no self-confidence. On the day before her birthday, she meets a mysterious alchemist, Hippocrates, and his student, Pipo, who both tell her they're on a mission to save the world. Together, they set out from the basement for "Wonderland," and Akane finds herself labelled Wonderland's savior.