Rendatsu no Kyoshitsu Volume 1, written by Tsukishima Shiiru and illustrated by MAIRO, will be released in Japan on September 25, 2026 under KADOKAWA's MF Bunko J imprint.
The light novel is based on the web novel Danjo-hi ga Kowareta Sekai de Gisugisu Suru Hanashi. It follows Mizuki as he enters an elite academy in a world with one boy for every 200 girls and becomes the center of a competition that may determine the futures of its heroines.
Quick Summary
- Japanese title: 恋奪の教室1 男女比が壊れた世界でギスギスする話
- Romanized main title: Rendatsu no Kyoshitsu
- Full romanized title: Rendatsu no Kyoshitsu 1: Danjo-hi ga Kowareta Sekai de Gisugisu Suru Hanashi
- Official English/global title: not yet announced
- Format: light novel
- Volume: Volume 1
- Japanese release date: September 25, 2026
- Author: Tsukishima Shiiru
- Japanese author name: 月島しいる
- Illustrator: MAIRO
- Publisher: KADOKAWA
- Imprint: MF Bunko J
- Book format: bunko paperback
- Page count: 328 pages
- Japanese price: 902 yen including tax
- ISBN: 978-4-04-660529-0
- Protagonist: Mizuki
- School: Shirayuki Academy
- World ratio: one boy for every 200 girls
- Story focus: girls from prominent families competing for male students
- Original format: web novel
- Web platforms: Kakuyomu and Hameln
- Preorders: now available
- Newly released material: Volume 1 cover illustration
- Official English edition: not yet announced
- Official Indonesian edition: not yet announced
- Anime adaptation: not yet announced
Announcement, Amazon, and Volume 1 Cover
The Web Novel Becomes an MF Bunko J Series
The story was originally published online as Danjo-hi ga Kowareta Sekai de Gisugisu Suru Hanashi. Its web version is available on Kakuyomu and Hameln, combining a reversed gender ratio with school factions, heavy emotions, and increasingly hostile relationships.
The MF Bunko J edition introduces Rendatsu no Kyoshitsu as its main title while retaining the web novel's name as a subtitle. MAIRO provides the character illustrations for the new bunko release.
The publisher has not explained how much of the web version will be collected or revised in Volume 1. Interior illustrations, retailer bonuses, and book-exclusive story changes have also not been detailed.
A 1:200 Ratio Turns School into a Competition
Mizuki enrolls at Shirayuki Academy, a school attended by daughters of influential families. In a society where boys are exceptionally rare, the presence of a male student carries considerable personal and social value.
The official synopsis says the girls compete through numbers, intelligence, physical ability, strategy, and psychological maneuvering rather than relying only on ordinary romantic approaches.
The result is a struggle for influence inside the academy. For the heroines, victory may affect their status, future, and position within their families or social groups.
The Cover Features Four Female Students
The Volume 1 illustration presents four uniformed girls gathered inside a room. Each has a distinct hairstyle, expression, and posture, while Mizuki does not appear in the main composition.
The arrangement places the heroines at the center and offers the first visual introduction to the group involved in Shirayuki Academy's competition.
The product announcement does not identify the four girls by name. Their relationships with Mizuki and their positions within the school's factions therefore cannot be confirmed from the cover alone.
The Heroine Race Uses Intelligence and Strategy
Rendatsu no Kyoshitsu does not reduce its conflict to whoever confesses first. The girls can form groups, use their family positions, study an opponent's weaknesses, and apply their individual abilities to gain an advantage.
Mizuki stands at the center as the boy being pursued, but the premise also raises questions about personal choice and social pressure in a world where men are extremely scarce.
Romance, factional conflict, yandere behavior, and emotionally intense relationships form part of the web novel's foundation. The exact heroine lineup and story developments included in Volume 1 remain undisclosed.
Why This Matters
1) The ratio shapes the entire social structure
The 1:200 figure is not merely an excuse to introduce many heroines. Male scarcity changes the academy, family expectations, and each character's position in society.
2) The heroine race goes beyond romance
The girls compete through intelligence, physical ability, supporters, strategy, and psychological pressure, allowing the conflict to develop like a struggle for influence.
3) The book edition introduces a new identity
The Rendatsu no Kyoshitsu title and MAIRO's illustrations give a new presentation to a story previously known by its web novel name.
4) The heroines may have different reasons to pursue Mizuki
Personal feelings, family expectations, and social interests can all influence their actions, preventing every relationship from functioning as a straightforward romance.
Light Novel Information
The important details currently known are:
- Rendatsu no Kyoshitsu is the book title of the web novel Danjo-hi ga Kowareta Sekai de Gisugisu Suru Hanashi
- the novel is written by Tsukishima Shiiru
- MAIRO illustrates the light novel edition
- KADOKAWA publishes it through the MF Bunko J imprint
- Volume 1 will be released on September 25, 2026
- the book contains 328 pages and costs 902 yen including tax
- its ISBN is 978-4-04-660529-0
- the story is set in a world with one boy for every 200 girls
- Mizuki enrolls at Shirayuki Academy alongside girls from prominent families
- the girls compete through numbers, intelligence, physical ability, strategy, and psychological maneuvering
- the cover presents four uniformed girls
- the product page does not identify the cover characters by name
- Japanese preorders are now available
- the web novel is available through the official Danjo-hi ga Kowareta Sekai de Gisugisu Suru Hanashi page on Kakuyomu
- publication details are available through the official KADOKAWA page for Rendatsu no Kyoshitsu Volume 1
- official English and Indonesian editions have not been announced
- manga and anime adaptations have not been announced
Closing
Rendatsu no Kyoshitsu Volume 1 brings Tsukishima Shiiru's web novel to MF Bunko J with a new title and illustrations. Its 1:200 premise turns Mizuki's school life into a competition shaped by romance, family status, and social power.
The first volume will be released in Japan on September 25, 2026. Retailer bonuses, interior illustrations, the collected story range, and publication outside Japan remain unannounced.
- Official X — Volume 1 Release Date, Preorders, Cover Illustration, and Story Introduction
- KADOKAWA — Release Date, Price, Page Count, ISBN, Format, and Official Synopsis
- Amazon Japan — Volume 1 Preorder Page and Publication Information
- Kakuyomu — Original Web Novel, Serialization, and Series Premise
- MF Bunko J — Official Label Page and September 2026 Release Lineup
