Yuika Koga

Name: Yuika Koga

Gender: Female

School Year: First-year high school student

Height: 150 cm

Affiliations: Library Committee, Calligraphy Club

Ethnicity: One-quarter British (maternal grandmother), three-quarters Japanese

Hair Color: Blonde

Eye Color: Blue

Dream/Goal: Become a picture book author

Yuika is a petite girl with blonde hair and blue eyes, inheriting her looks from her British grandmother.

Her delicate, doll-like appearance makes her stand out, and she seems almost too beautiful to be real.

Despite her foreign looks, she is very traditional and Japanese at heart.

She is notably bad at English, which contrasts humorously with her appearance and heritage.

On the surface, Yuika is straightforward, bright, and charming, with a smile that people often describe as angelic.

However, this sweet exterior hides her true nature as a sadistic "queen" who loves to dominate the boy she likes.

Yuika’s maternal grandmother is a British woman, and her father is Japanese, making Yuika a quarter British by blood.

Her grandmother’s foreign lineage is the reason for Yuika’s blonde hair and blue eyes.

Her family background and appearance sometimes make others expect foreign-language skills from her.

This only adds to the irony that she struggles with English and is culturally very much a Japanese girl.

Yuika is the junior of Keiki Kiryuu at school and serves on the Library Committee.

She also belongs to the Calligraphy Club, which fits her quiet and bookish image.

At the beginning of high school, Yuika behaved in a cold, almost mechanical way.

She pushed others away, gave off an unapproachable aura, and accepted being isolated from her classmates.

Despite her self-imposed distance from others, Keiki Kiryuu repeatedly talked to her and reached out.

His kindness gradually warmed her, and this consistent attention became the seed of her romantic feelings.

Yuika’s true personality is that of a dominant, sadistic girl with a queen complex.

She enjoys “training” Keiki Kiryuu, the boy she is in love with.

Her idea of affection is intense and extreme, often taking the form of perverse teasing and control.

One of the most shocking examples is when she stuffed her own underwear into Keiki’s mouth, causing him to faint.

This traumatic event left a deep psychological scar on Keiki Kiryuu.

For Yuika, however, it was an expression of her twisted love and desire to dominate him.

She openly wishes to discipline and train Keiki as her personal servant.

Her behavior mixes pure love with extreme sadism, making her one of the most distinctive heroines in the series.

Yuika slowly fell in love with Keiki Kiryuu because he kept speaking to her when she was isolated.

His unwavering kindness made her feel seen and accepted, breaking through her cold facade.

She cherishes him as the one person who reached out when she was surrounded by emotional distance.

This gives her feelings a surprisingly pure and earnest core beneath her kinky tendencies.

At one point, Yuika interprets something Keiki says as a proposal.

Blushing furiously, she accepts, showing a very innocent and straightforward side to her love.

Her reactions around Keiki often swing between bold sadism and shy, girlish affection.

This contrast is a key part of her charm and comedic appeal.

Yuika is deeply self-conscious about her small chest.

Her complex about this becomes a recurring gag and emotional trigger.

She considers Sayuki Tokihara, who has a large bust, to be her rival in love.

Because of this, Yuika mockingly refers to Sayuki as “Witch Senior,” highlighting both rivalry and resentment.

Their relationship is filled with tension, competition, and comedic clashes over Keiki Kiryuu.

Yuika’s rivalry with Sayuki feeds into the series’ love polygon and fan-favorite character dynamics.

Yuika loves books and spends much of her time in the library.

Her passion for reading naturally leads into her creative ambitions.

Her dream is to become a picture book author.

She is currently working on her own picture book titled “The Shy Princess.”

This project reflects her inner world: a mix of vulnerability, cuteness, and quiet longing.

It contrasts sharply with her sadistic queen persona, showing a softer and more delicate heart.

Yuika has gained significant popularity among fans of Hensuki.

She is frequently highlighted in character polls and promotional events.

In the “MF Bunko J Heroine Contest 2017 in Melonbooks,” held from September to October 2017, she ranked 4th.

This contest was organized through the Melonbooks chain and focused on heroines from MF Bunko J titles.

In the “KADOKAWA Light Novel Heroine General Election,” conducted from April to May 2018 by KADOKAWA, Yuika placed 2nd.

This strong showing cemented her status as one of the most beloved heroines of the franchise.

In the television anime adaptation of Hensuki, Yuika Koga is voiced by Rina Hidaka.

In the drama CD adaptation, she is voiced by Ari Ozawa.

These performances bring out both her angelic sweetness and her sadistic queen side.

The contrast in her voice acting enhances her dual nature and makes her scenes especially memorable.