Imoto Wo Koryaku Suru No Mo Taisetsuna Oshigotodesu. (MF Bunko J) [Light Novel]

[Machine Translation] Ryoji Kauchi, a novelist editor, has a younger sister, Ryoufu, with whom he is hopelessly inseparable. She used to be so cute that she made a dangerous promise to Ryoji: "I'm going to give my brother my first time, right? But now she doesn't even call him "big brother. But the editor's work is so relentless that it makes her forget about her sister. Especially now that the illustrator of a popular work, which has even been made into an anime, is ill and has left the board! One day, Kauchi falls in love at first sight with an illustration of a very popular erotic game and asks the original illustrator for a job - but the illustrator who shows up at the meeting is his younger sister, Ryoufu, who is underage! The light novel x romantic comedy about the world's worst friends, brother and sister, is about to begin!

ラノベ編集者の賀内亮二には、絶望的なくらい仲が悪い妹・涼風がいる。昔は「お兄ちゃんに初めてをあげるね?」なんて危ない約束をするほど可愛かったというのに、今では「お兄ちゃん」とすら呼んでくれない。けど、編集者の仕事は妹を忘れさせてくれるほど容赦無い。そう、アニメ化もした人気作のイラストレーターが病気で降板してしまった今なら特に!必死で後任を探すがなかなか見つからず、そんなある日、賀内は大人気エロゲのイラストに一目惚れし、その原画家に仕事の依頼をする―が、打ち合わせの場に現れたイラストレーターは、未成年で妹の涼風だった!?世界一仲が悪い兄と妹を巡るライトノベル×ラブコメ、ここに開幕!