Muramasa Senjū, legally Hana Umezono, is the bestselling light novel author behind "The Legend of the Phantom Blade." She entered the professional sphere to sidestep family disapproval of her writing, yet adheres to their frugal principles, subsisting on a modest monthly stipend despite substantial earnings. She writes purely for personal satisfaction, convinced books crafted to her own taste surpass other media. Task delegation, such as titling, falls to editors; publication results and reader opinions hold little interest. Her creative bursts involve deep immersion, often rendering her oblivious to her surroundings. Physically petite at 150 cm, she presents an adolescent appearance with lavender eyes and black hair (purple in manga), typically cut in a jaw-length bob. Traditional attire defines her style: kimonos or yukatas paired with classical obi sandals. A waist-tied satchel carries her writing materials. Bandages consistently wrap her right-hand fingers, a mark of intensive writing. Alternate clothing includes a sailor-style school uniform and a sundress with parasol while traveling. Personality-wise, she displays apathy towards industry peers, frequently forgetting names like fellow author Elf Yamada and dismissing others' works. An exception is her intense fixation on Masamune Izumi, whose battle novels she admired since his web-novel days. Initially, she adopts a cold, antagonistic stance towards him, sabotaging his publication schedule to force a genre return. This facade crumbles when she confesses her fandom and romantic feelings; rejection doesn't deter her persistent support. She exhibits pronounced rivalry with Elf over Masamune's attention, yet collaborates when beneficial. Beneath the aloof exterior lies shyness, discomfort with revealing clothing like bikinis, and genuine excitement discussing literature. Her primary relationships center on Masamune Izumi. After he shifted to romantic comedy, she sabotaged him by stealing his publication slot. Learning of his financial struggles supporting his stepsister Sagiri, she offered him employment as her exclusive novelist. Following her defeat by him in the Light Novel Tenkaichi Budōkai, she acknowledged his dedication and ceased interference. Interactions with Sagiri are limited but respectful, especially after Sagiri confronted her about endangering Masamune's dreams. She maintains distant professional ties with her editor, Ayame Kagurazaka, rarely recalling her despite heeding advice concerning Masamune. Professionally, she ranks among the elite "Hachiraijin" authors, with sales exceeding 14.5 million copies. Her combat-themed writing inadvertently overshadowed Masamune's early works, causing fans to mistakenly label him her imitator. She possesses exceptional writing speed, comparable to Masamune's, and holds seven "A-Level" skills per Elf Yamada's assessment. Her series hiatus originated from displeasure over Masamune's genre shift, not creative limitations. Her character evolves from antagonist to ally. After losing the Tenkaichi Budōkai, she reconciles with Masamune's artistic choices, supports his dreams, and sustains unrequited affection without resentment. This concludes her initial sabotage while establishing ongoing, complex collaborative dynamics within the author community.