Atsuko Kanase, whose name is written in Japanese as 叶瀬あつこ, is a Japanese creator known for originating multimedia projects, particularly in the realm of otome and reverse harem narratives. Her most prominent and defining work is the Brothers Conflict franchise, for which she serves as the original creator and series planner. Her role is distinct from that of the writer; for the Brothers Conflict light novels, Kanase is credited as the creator while Takeshi Mizuno handles the series composition and writing, with illustrations provided by Udajo.

The Brothers Conflict series began as a light novel in December 2010, published by ASCII Media Works, and ran for seven volumes until July 2012, with a second season of five volumes following in 2013. This series established the central premise that would define her creative identity: a young female protagonist navigating complex romantic tensions within a large family setting. In Brothers Conflict, high school student Ema Hinata gains thirteen stepbrothers after her father's remarriage, leading to a competitive and often comedic struggle for her affection among the siblings.

Kanase’s role as an original creator extends beyond the initial novel series, encompassing a broader franchise that she helped architect across multiple media. Under her original concept, Brothers Conflict expanded into a significant multimedia property. It was adapted into a series of otome video games developed by Idea Factory and published under their Otomate label, beginning with Brothers Conflict: Passion Pink for the PlayStation Portable in May 2012. The property also spawned numerous manga adaptations, including a yonkoma series titled Brothers Conflict Purupuru, as well as character-focused spin-offs such as Brothers Conflict feat. Natsume and Brothers Conflict feat. Yusuke&Futo, for which Kanase is credited with the original story.

The franchise reached a wider audience with an anime television series adaptation produced by the studio Brain’s Base, which aired for 12 episodes from July to September 2013. This was followed by a three-episode original video animation (OVA) series released between December 2014 and February 2015. Across all these adaptations, Kanase’s foundational role as the creator of the world, characters, and initial concept remained consistent.

As a creator, Kanase’s artistic identity is closely tied to the reverse harem genre, characterized by a single female lead and multiple male love interests. Her work typically blends romantic comedy with family drama, a combination that became the signature of the Brothers Conflict franchise. A recurring theme in her work is the tension between familial bonds and romantic attraction, often set within a blended family structure where the protagonists are not related by blood, allowing for the exploration of these relationships without the element of incest. The Brothers Conflict series exemplifies this with its focus on Ema’s adjustment to her new family and the subsequent romantic rivalries that develop among her stepbrothers.

Kanase’s industry significance lies in her role as a successful originator of a cross-media franchise within the otome and reverse harem market. The Brothers Conflict franchise proved to be a commercially viable property, generating a sustained line of light novels, multiple video game adaptations, a diverse array of spin-off manga, and an anime series, all originating from her initial concept. This demonstrates her ability to create a property with enough foundational appeal to support extensive adaptation across the Japanese media mix model, a key factor in the anime and manga industry.