Muramasa Senju is a popular novelist in Eromanga Sensei. She is a middle school girl who talks and acts like an old-fashioned, serious person in public, but shows a cute and childish side in private. Muramasa is famous for powerful school battle stories, but doesn’t care about fame or money. She became a writer because she wanted to read stories she couldn’t find anywhere else. Her meeting and rivalry with Masamune Izumi becomes a big turning point in her personal life and writing.
Muramasa Senju usually wears traditional Japanese clothes, mostly kimonos, whenever she goes outside.
She has a well-developed figure, which other characters sometimes mention.
Muramasa always carries a notebook to write down ideas whenever inspiration comes to her.
Her look is cool and classic, making her stand out among other students.
Cool and Serious in Public
When people see Muramasa in public, she seems calm, strong, and polite like a true Japanese beauty.
She uses tough, old-style speech when talking.
Childish Side in Private
When alone or with close people, she can act childlike, calling her father “Papa” and showing her real feelings.
She cares little for fame, popularity, or how many fans she has.
She sometimes shows odd behavior, like always wrapping bandages on her fingers and being extremely focused when writing.
Unique Habits
She prefers to write all her stories by hand instead of using a computer.
Muramasa does not like technology very much, gets confused by ATMs, and does not use cellphones.
If she misses a deadline, she even punishes herself in scary ways, like taking off a fingernail.
- Real Name: Hana Umezono
- Grade: 8th grade, Second year of middle school
- Occupation: Best-selling light novel author
- Pen Name: Muramasa Senju
- Blood Type: O
- Parents: Her father is Rintaro Umezono, a famous author
Muramasa became a professional writer before Masamune Izumi, so she asks him to call her "senpai."
Her pen name, “Muramasa Senju,” is inspired by famous sword makers, just like Masamune’s pen name.
Other students think the student Hana Umezono is normal and friendly.
She lives in Chiba prefecture.
Muramasa’s stories, mainly about battles at school with special powers, are very popular and turned into anime.
She is known for her deep world-building and careful attention to story settings.
Muramasa can write with amazing focus, often not noticing the world around her when she gets inspired.
She has written hard science fiction stories in the past.
Even though she doesn’t use computers to write stories, she claims she can use them a little.
- Masamune Izumi: Muramasa is younger than Masamune, but entered the writing world earlier. She has been his biggest fan since his online writing days, saving all of his stories. After competing with him, she falls in love and confesses, but Masamune rejects her. Still, she remains deeply in love with him.
- Sagiri Izumi: Sagiri calls her “pervy body” because Muramasa’s body is more mature compared to middle school girls.
- Her Father: Rintaro Umezono, a famous writer who she calls “Papa.”
- Muramasa only wears traditional Japanese clothes and does not wear any underwear under her kimono.
- Her stories sell so well that combined sales by the second book reach 14.5 million copies.
- She loves Masamune Izumi’s “Japanese-style battle novels” the most. She read his story “Reincarnation Silver Wolf” so deeply that she bonded with the characters.
- She joined a contest with the plan to “destroy” Masamune’s romance novel and win him over as a writer who writes only for her.
- Even though she is famous as Muramasa Senju, her ordinary life as Hana Umezono is liked by everyone around her.
- Some fans initially thought she might be a grown-up version of another character, but her real name is revealed as Hana Umezono, proving they are not the same.
Becoming a Fan of Masamune Izumi
Muramasa starts out as a huge fan of Masamune Izumi’s stories, especially his online Japanese-style battle novels.
She keeps every one of his works and is inspired by them in her own writing.
She wanted to read stories just like his, so she became a writer herself.
Her Writing and Fame
Her best genre is school battle novels.
Even after her works became big hits and were turned into anime, Muramasa herself didn’t care about sales or fame.
By the second book, her book series had sold 14.5 million copies.
The Challenge and Competition
When she hears Masamune is moving toward writing a romance comedy, Muramasa joins a special writer’s event to stop him.
She even says she’ll pay him from her royalty income to write stories just for her.
Muramasa doesn’t care about keeping up with trends—she just wants her ideal stories.
Developing Feelings for Masamune
Through their rivalry, Muramasa grows to not only love Masamune’s writing, but also Masamune as a person.
She confesses her feelings, but Masamune turns her down.
Despite his answer, Muramasa continues to love him openly.
Rumors and True Identity
Fans once thought Muramasa might secretly be another familiar character, but by volume 6, it is clear Muramasa is Hana Umezono, a different person.
In the anime, fans even see Hana Umezono as her regular self, living happily with her family.
Muramasa Senju stands out for her classic fashion, strong will, and quirky habits.
She is a unique mix of an old-fashioned, serious writer and a fun, loving middle school girl.
Her love for stories, and for Masamune Izumi, shapes everything she does.
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