Koi Shita Hito Ha, Imoto No Kawari Ni Shindekure to Itta. Imoto to Kekkon Shita Kataomoi Aite Ga Naze Imasara Watashi No Moto Ni? to Omottara 4 [Light Novel]

[Machine Translation] Wisteria, the Keeper of the Otherworld, stares at her unawakened apprentice and blames herself. While searching for the cause of the sudden outbreak of demons, Lloyd, who is not resistant to the thick miasma, was exposed to it because he protected himself. When he woke up and urged him to return to his "original world" as soon as possible, he was only told, "I can't leave you to die. They argue about their strong feelings for each other, and as the time limit for their return approaches, they become impatient and unleash the decisive words. With their differences remaining, they head off to search for the remaining snake vines, but the giant spider that they had feared appears! I won't leave you - ever! The end of the fierce battle awaits: farewell or - ? Or... The fourth volume of the master-disciple love fantasy between a lonely former daughter and a genius nobleman! Includes newly written extra chapter and the first episode of the comic book version!

異界の番人・ウィステリアは目覚めぬ弟子を見つめ自分を責めていた。突然の魔物大量発生の原因を探す中、耐性のないロイドが濃い瘴気を浴びたのは自分を庇ったからだ。目が覚めた彼に一刻も早く“元の世界”に帰れと迫っても、「あなたを見殺しにできない」と言われるばかり。互いを強く想うがゆえの口論を白熱し、帰還のタイムリミットが近づく焦りも加わって決定的な一言を放ってしまう。わだかまりを抱えたまま、残る蛇蔓の捜索へ向かうが、懸念していた大蜘蛛が出現!?「あなたを置いていきはしない―決して!」苛烈な戦いの末に待つのは、別れ?それとも―。孤独な元令嬢×天才肌の貴公子の師弟恋愛ファンタジー第4巻!書き下ろし番外編&コミカライズ第1話収録!