Voiced by: Toriumi Kousuke

The substitute-Supreme Pontiff of the Amakusa Catholics, who saves people for the sake of saving them rather than for any ulterior motive. A capable leader, he strives to rebuild the group so that Kaori, who left the group and rejected the position of Pontiff in order to protect them from any incidents that would occur as a result of her status as a Saint, would feel welcome to return to them some day.

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• Anime Hair
• Badass
• Big Good: Kind-of. As the substitute-supreme Pontiff of the Amakusa he's one of the biggest authority figure clearly on the side of good, but that's not saying much.
• Chivalrous Pervert: He's not above making Kaori and Itsuwa wear embarrassing costumes for the hell of it.
• Cool Sword
• Delinquents: Most of the Amakusa look like stereotypical thugs, which couldn't be farther from the truth.
• Expy: He looks like Mugen, which is somewhat weird because Mugen was himself an Expy of Spike Spiegel.
• Freaky Fashion, Mild Mind
• Paper Master: True to the Amakusa's roots in Onmyodo.
• Shipper on Deck: Like the entire sect, he encourages Itsuwa and Touma. Once, frustrated by Itsuwa taking it too slowly, he precisely kicked a soccer ball into the back of Touma's head, so he would fall directly into Itsuwa's cleavage.

She’s a 16-year old girl who’s among the members of the Amakusa Catholic Church. Her weapon is a Friulian Spear that can be disassembled and reassembled, for purposes of carrying it around without people noticing it. She has romantic feelings towards Touma but due to her shyness was not able to convey them to him. She won't let any girl be with him, even telling her former Supreme Pontiff Kaori, who also has feelings for Touma, that she will never give him up to her.

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• Absolute Cleavage
• Almost Kiss: She almost kisses Touma when he’s lying in his bed in Volume 16.
• Badass Adorable
• Berserk Button: Just don't mess with Touma.
  • Beware the Nice Ones: Itsuwa may look a shy, polite, weak girl but when Touma ALMOST got killed by Acqua, she becomes an angry, merciless woman wanting revenge.
    • And when Tatemiya tried to make a practical joke on her, she responded by throwing a table in his face.
• Blade on a Stick: Her Weapon of Choice
• Bodyguard Crush: With Touma in Volume 16.
• Clothing Damage
• Cosplay: Wearing a Great Elemental Spirit/peep-maid costume.
• Cry Cute
• Healing Hands
• Lightning Bruiser
• Love Hurts
• Nice Girl
• Purple Eyes - In the novels original design.
• Razor Floss
• The Red Mage
• The Rival: She has a friendly rivalry with her sempai, Kanzaki Kaori. Why? They both like the same guy.
• Running Gag: More of cute than funny. During Touma's time in Italy her inter actions with Touma consists of her giving him a hot towel on multiple different occasions.
• Shy Blue-Haired Girl
• Stripperific: She uses a magic that transfers damage to her clothes instead. Oh Yes!
• Tranquil Fury
• Universal Driver's License:She can ride a motorcycle, which makes sense since she's a teen. But a helicopter as well?!
• Yamato Nadeshiko