Koharu Hidaka

Koharu is notable for her beautiful facial features and developed figure, especially drawing attention in her class.

She initially wears her hair short, but grows it longer during high school, adopting a more mature appearance.

As an adult in "Hi Score Girl DASH," she ties her long hair back.

• Date of Birth: April 4, 1979
• Blood Type: A
• Age in "DASH": 28

Koharu is naturally quiet and struggles with social interactions, often avoiding the spotlight.

After discovering gaming, she reveals a passionate, competitive, and sometimes mischievous side.

Her affection for Haruo makes her intense and sometimes even a bit sadistic, especially when frustrated by his obliviousness.

Despite her shy roots, she becomes outgoing and determined, especially in achieving her goals.

Koharu is the daughter of a liquor store owner.

During middle school, her family’s store installs an MVS arcade cabinet, coinciding with her first interactions with Haruo Yaguchi, her classmate.

This event draws her into arcade games and makes her curious about Haruo’s world.

She had always been hobbyless and reserved until her exposure to the throbbing excitement of gaming.

Initially, Koharu is inexperienced with games and often relies on button mashing ("gacha play"), yet she has a remarkable natural talent, pulling off difficult moves by sheer luck at first.

As she trains, she rapidly improves, eventually defeating Haruo—even when he was an experienced player.

She masters a variety of fighting game characters across several franchises, adapting to whatever the game demands.

Notable main characters used:

• Sagat ("Street Fighter Alpha" series)
• Phobos ("Night Warriors")
• Yuri Sakazaki ("Art of Fighting" series)
• Duck King ("Fatal Fury Special")
• Raiden ("Mortal Kombat 2")
• Ukyo Tachibana, Neinhart Sieger ("Samurai Shodown" series)

With Haruo Yaguchi

Koharu's interest in Haruo grows as she witnesses his excitement and passion for games.

She falls in love with him, finds herself caught in a rivalry with Akira Ono, and tries in various ways—both sweet and challenging—to win Haruo’s affection.

With Akira Ono

She is very curious, even unsettled, about the relationship between Haruo and Akira Ono.

Her feelings for Haruo become a powerful motivator, driving both her affection and her competitive side.

• She was nicknamed "Big Bust" by Chihiro Onizuka during their childhood due to her physical development.
• Her transformation from a reserved girl to a passionate gamer is influenced by her interactions with Haruo.
• In "DASH," as a teacher, she deals with comments about her appearance and is often targeted for her looks by school staff.

Middle School Era

Koharu’s story begins with her as Haruo’s classmate.

Though she has an attractive appearance, her shyness keeps her on the margins of her class.

She becomes fascinated by Haruo’s obvious joy for video games, something absent in her own life.

The introduction of the MVS arcade cabinet at her family store and a chance after-school encounter brings them together.

At first, she cannot keep up with Haruo’s gaming expertise, but she grows interested—buying "Gamest" magazine and eventually a Super Nintendo of her own.

She displays surprising skill, frequently pulling off hard moves by accident, which impresses Haruo.

After their high school entrance exams, she trains at game centers and her own store, developing into a formidable competitor.

Her growing confidence lets her sometimes tease and challenge Haruo.

She gradually develops strong feelings toward Haruo, especially after seeing both his good and bad sides—his rebelliousness, passion, and unexpected kindness.

A failed attempt to give him Valentine’s chocolate makes her realize her growing romantic attachment, even as Haruo remains oblivious.

The emergence of Akira Ono leads to misunderstandings and emotional struggles, with Koharu often feeling unable to confess her feelings or clarify the situation.

During the school trip, an accident leaves her and Haruo stranded at a train station, which briefly allows her to feel as if on a date, though she is frustrated by Haruo’s lack of awareness of her feelings and his close bond with Ono.

High School Era

Due to her parents' wishes, Koharu attends an all-girls’ high school, further maturing in appearance and attracting the attention of boys at other schools.

Dissatisfied with her stagnant relationship with Haruo, she decides to become even better at games, hoping to get him to notice her by surpassing his skills.

Her rapid progress makes her able to defeat Haruo easily, even spurring him on to get back into gaming after a slump.

A direct confrontation with Akira Ono highlights the strong bond between Haruo and Akira, deepening Koharu’s awareness of Haruo’s affections.

Eventually, overwhelmed by her feelings, she challenges Haruo: if he wins, she’ll give up; if she wins, he must date her.

She trains relentlessly, inspiring other gamers around her and taking her to even greater heights.

Despite a close loss, her conflicted emotions come out in an outburst, and instead of withdrawing, she remains painfully in love, displaying both a sadistic side and incredible passion.

Nearing the finale, she cuts her hair short and, understanding Akira’s feelings, chooses to step back for Haruo and Akira’s sake.

Hi Score Girl DASH

Koharu is the main protagonist.

In 2007, now age 28, she works as a Japanese teacher at her alma mater, South Junior High, still single and living in an apartment near her family’s store.

She heads a tough class full of troublemakers, dealing with constant stress from the principal—who criticizes both her class and her appearance—and unwelcome attention from male staff.

Her appearance changes again: her long hair is tied back, and she often looks tired or downcast.

She has distanced herself from games for a while.

However, after noticing her students frequenting gaming arcades, the old spark reignites and she begins connecting with the gaming world once again.

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