Chidori is the third member of Strega, and is known for her gothic lolita dress style, self-harming tendencies, and artistic ability. In battle she utilizes a red chained hand-axe. She is Fuuka's counterpart on the Strega team, and uses Medea's ability to radiate energy to keep Strega from being detected by Fuuka's Personas. Like Takaya, she shows unusual Persona abilities, such as being able to heal people and manifest Medea outside of the Dark Hour.

Chidori and Junpei meet by chance at Port Island Station. While she is initially very unpleasant to Junpei because he keeps interrupting her sketching, she eventually opens up to him due to his kindness and persistence. At the same time, Junpei tells her everything about SEES without knowing that she is a member of Strega. Chidori is led to believe that Junpei is SEES' leader.

During a full moon, Chidori kidnaps Junpei, thinking that he has the authority to call off SEES' mission to kill the Arcana Shadows. When plan fails she is wounded, and ends up imprisoned in a Kirijo-controlled hospital. Mitsuru and Akihiko try to interrogate her, but meet with little success.

Junpei continues to visit Chidori in the hospital, and the two become closer. He is very concerned about her capacity for self-harm. However, after faking his death, Takaya returns to remind her where she truly belongs. Chidori is broken out of the hospital and rejoins Strega. However, her loyalties begin to falter when she is forced to fight Junpei, and when he is wounded by Takaya, she comes to terms with her love for him. She sacrifices her life to save his through the use of her Persona, and ends up giving Junpei some of her Persona's regenerative power, namely the passive skill Spring of Life which restores HP every turn. After her death, Junpei inherits her sketch-book, which turns out to be full of drawings of him.

In the Persona 3: FES expansion, it is possible for the player to revive Chidori later in the game if certain requirements are met.