Hikayu Hoshikawa is a 17-year-old heroine from the visual novel "Milky Way Under the Starry Sky." She is gentle and tends to be shy, but she is also very loyal to the main character, Masayuki, who is her childhood friend. Although Hikayu is usually just an average high school girl with no combat skills, she gains amazing abilities in an alternate world thanks to a fan disc created by Nishio Ōnishi. Her sudden transformation into a powerful fighter comes with a very revealing costume, which embarrasses her. Even after losing her fighting powers later, she survives the story and returns to her own world, grateful for meeting Masayuki.
Hikayu is of average height.
She has pink hair styled in half-twin tails and wears ribbon hair accessories.
Her typical outfit is a school uniform: a white blouse, a green blazer, and a red skirt.
She wears black knee socks with ribbons and brown strap shoes.
Hikayu is shy and soft-spoken, but she cares deeply about others.
She is especially devoted to Masayuki, her childhood friend, and is very loyal to him.
Though she often doubts herself, she can stand up for what is right and tries to persuade others when needed.
She loves dogs.
Hikayu is the main heroine in the game "Milky Way Under the Starry Sky," which is known to have originated as an adult game but was later made into an all-ages version.
She appears on the game’s cover, proving her role as the main heroine.
In the game, a certain event brings her closer to Masayuki, but many other female characters also appear.
Eventually, it is implied she and Masayuki become a couple.
When she realizes her story has been watched by many people in the real world, she is extremely embarrassed and even cries publicly.
Usually, Hikayu is a normal high school girl with no combat abilities.
In the Border World Colosseum, thanks to Nishio Ōnishi's fan disc, she transforms into "Extreme Final Legend Martial Artist Hikayu," suddenly gaining incredible fighting skills and wearing a very revealing outfit.
Her weapons include nunchaku, and she can perform powerful moves, such as smashing the ground with her fists.
She later loses these powers when Altair uses "Concept Source" to return her to her original powerless state.
Hikayu has a deep connection with Masayuki, the main character of her original game, as childhood friends who fall in love.
She also interacts with Nishio Ōnishi, the scenario writer who helped give her new powers, but is often embarrassed by his outrageous ideas.
She becomes friends with other characters like Selesia Upitiria, Shō Hakua, Blitz Talker, and Yūya Mirokuji after joining their group in the real world.
- "Wh-Why does everyone know about me!?"
- "Extreme Final Legend Martial Artist Hikayu! Here I come!"
- "That tiny, shameless costume again... on me!?"
- "Extreme Final... why do I have to wear this outfit again!?"
Beginnings in the Real World
Hikayu is the second character after Meteora Österreich to appear in the real world from her game.
At first, she is scared and overwhelmed, especially when she realizes her private story has been seen by so many people.
Gaining Powers in the Battle
Although she has no fighting ability, Nishio Ōnishi proposes using a fan disc to grant her new powers.
Hikayu joins the Border World Colosseum, wearing a flashy, revealing Chinese dress and wielding nunchaku.
Even though others are shocked by her new look, her fighting strength becomes real, and she defeats Shō Hakua with the "Meteor Hell Fist."
Standing Up for Friends
After her victory, Hikayu comforts Shō, telling her Yūya Mirokuji is not responsible for her sister's death, helping her join the group.
She helps calm Selesia Upitiria when emotions run high and even bravely attacks Charon Seiga's mecha with her bare hands to stall for time.
Losing Power and Returning Home
During the final battle against Altair, Hikayu attempts to fight back, but her combat form is erased by Altair’s powers, returning her to her original game heroine state.
Altair spares her life, believing it unnecessary to harm unarmed people, but Hikayu feels powerless in the face of Altair’s immense strength.
After Setsuna Shimazaki arrives and everything ends, Hikayu learns that, because of her new popularity, there will be an anime based on the fan disc, and she's embarrassed about wearing the skimpy costume again.
Final Goodbye
Before leaving, she thanks Masayuki for everything and returns to her own world, even as others continue to tease her and her creator keeps planning funny but embarrassing new ideas.
- Hikayu appears in advertisements for a special anime based on her transformed hero version, with taglines highlighting her embarrassment about the costume.
- Her transformation scene and struggles with her new image became popular both inside and outside the story universe.
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