Seira Mimori is a classmate of Meimi Haneoka, and is the only person who knows of her escapades as Saint Tail. Seira is a nun-in-training who is usually found at the chapel after school where many people go to her and relay their personal problems, usually problems which involve something being stolen. In turn, she relays this information to Meimi, who helps this person out as Saint Tail. Seira is rather quiet and contempative, the opposite of her best friend Meimi. She will sometimes stand in for Meimi when she needs a double during the series. Seira is also very observant, and caring, expressing her concern when she is frightened that Meimi will be discovered.

Meimi Haneoka, 14, is a normal girl during the daytime, but during the night, she assumes the "position" of Saint Tail, a modern-day Robin Hood who steals from thieves and gives items back to their original owners. She is aided by her friend, Seira Mimori, a nun-in-training, and she is chased by her classmate (and soon-to-be love interest), Daiki Asuka (often called "Asuka Jr."). <br><br>
(Source: Anime News Network)

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Mother of voice actress [Honoka Inoue](https://anilist.co/staff/129363/Honoka-Inoue). She has held a long-running gag of being 'eternally 17 years old'.

An uncatchable thief is plaguing the city. No one knows her true identity and the police are unable to stop her. She is only known as Saint Tail. At St. Paulia Junior High, a young student named Asuka Jr. makes it his mission to find, stop, and apprehend the elusive Saint Tail. Little does he know that the nocturnal thief is really his friend, Meimi. Aided by a novice nun, Meimi steals to help the needy. Don't miss any of Saint Tail's magical exploits in the tale of this modern day Robin Hood.<br><br>(Source: Tokyopop)

Mimori Seira