Hanna is a character who appears in the Modern Era arc of the story. She is a student at Minamoto Junior High School, where she serves as the president of the Occult Research Club. Her appearance is characterized by short, somewhat messy black hair with a cowlick on top of her head. She wears opaque, aviator-like glasses that obscure her eyes from the reader or viewer.

In terms of personality, Hanna is generally a quiet and stoic girl who rarely smiles. This reserved demeanor commands respect from her fellow club members, who formally address her as president. However, she is more open with her emotions when she is alone with her best friend, Mizuha, demonstrating a warmer and more vulnerable side that she typically keeps hidden from others. She is also known to enjoy quiet hobbies such as sewing and knitting.

Hanna's primary role in the story is as the closest friend to Mizuha, a girl who becomes an important figure in Fushi’s journey through the modern era. Her motivations are fundamentally rooted in her loyalty and care for Mizuha. She is consistently protective of her friend, defending her from the gossip of other students and checking on her well-being. A key motivation is her desire to maintain and protect their friendship. This is highlighted when she feels deeply hurt after overhearing Mizuha dismiss a handmade hair tie, a symbol of their bond, as a silly thing. This moment of pain leads to a major confrontation, where Hanna throws the hair tie away and runs off in tears, though this stems from her deep investment in the relationship rather than a wish to end it.

Her relationship with Mizuha is the most significant in her narrative. The two are inseparable, often spending time together at school and the mall. Hanna is a pillar of support for Mizuha, especially concerning the girl's troubled relationship with her mother. She encourages Mizuha to communicate her feelings about not wanting to move away and offers a comforting presence. The bond is complex, as it becomes clear that Mizuha harbors romantic feelings for Hanna, a revelation that leaves Hanna confused and speechless, as she initially interprets the affection as purely platonic. Hanna’s relationship with other students is more formal; she is respected as the Occult Research Club president but is not particularly close with the other members, initially refusing to attend their weekend meetups.

Hanna undergoes notable development as she navigates the challenges of her friendship with Mizuha. Initially presented as simply a quiet and supportive friend, she is later shown grappling with the confusing and painful aspects of their relationship. The incident where she overhears Mizuha's dismissive comment represents a turning point, causing her to question the value Mizuha places on their friendship. Ultimately, however, her caring nature prevails. She takes action to help Mizuha confront her mother about their family's planned move, showing her commitment to her friend's happiness even after their conflict.

While Hanna does not possess supernatural abilities, her notable skills are domestic in nature. She is adept at sewing and knitting, activities she often engages in while in the club room. This talent is a key part of her character, as the handmade hair tie she gives to Mizuha serves as a central symbol of their connection.