Shiho Miyano was a former member of the Black Organization under the code name Sherry. A gifted chemist at a young age, she was the inventor of APTX 4869, the poison that shrank Shinichi Kudo. Shiho betrays the organization after Gin killed her sister, Akemi Miyano. Shiho took the drug in a suicide attempt, but rather than dying, she, like Conan, became small. She is taken in by Dr. Agasa and is given the alias Ai Haibara. She shows affection towards Conan, but she denies having such feelings. Despite being constantly in the company of the Junior Detective League and Ran Mouri, she was very reserved and only opened up a little more to Ran and Ayumi after some time; she is on a first name basis with Ayumi who calls her "Ai-chan". She often helps Conan solve cases and find information on the Black Organization to help bring them down in addition to working on the cure to their condition.

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