Kusa Joshi De Hikikomori No Ane Ha Inkyo Shitaiga, Gitei (Ototo) Ga Sore Wo Yurushitekurenai (Noche Books) [Light Novel]

[Machine Translation] After the death of her father, the rotten and reclusive Countess Euilly became the head of the Count's family despite being a woman. She is supported by her talented and extremely beautiful brother-in-law, Lars. Although Lars is an adopted son, he is fulfilling his duties as acting head of the family in place of his disappointing sister-in-law. So Euilly decides to hand over the reigns to the adult Lars and live a life of seclusion in the countryside so as not to get in his way. Now I can live the rotten girl life of my dreams..." she giggles. She gloats, and the day she sets out for the countryside. Somehow, Lars easily finds out about her retirement plan, and declares that he will make her his wife... and the cool brother-in-law's obsessive love explodes! A fantasy of monopoly and love!

父の死をきっかけに、女ながらも伯爵家の当主となってしまった、腐女子で引きこもりの伯爵令嬢ユイリー。そんな彼女を支えてくれたのは、有能で超美形な義弟ラースだった。養子であるラースだけれど、不甲斐ない義姉に代わり、当主代行の務めを立派に果たしてくれている。そこでユイリーは、成人したラースに家督を譲り、彼の邪魔にならないよう田舎で隠居生活を送ろうと決意する。これで夢の腐女子ライフが送れるわ...とほくそ笑み、いざ出立の日。どういうわけか隠居計画があっさりラースにバレてしまい、おまけに「姉さんを妻にする」と宣言されて―クールな義弟の執着愛が炸裂!?独占欲が大・爆・発の蜜愛ファンタジー!!