Isekai De Kishi Dan Ryocho Ni Narimashite Ryocho Ni Natta Tsumori Ga 2 Nin No Ikemen Kishi No Hanryo Ni Natteshimaimashita (&arche) [Light Novel]

[Machine Translation] Sota Kashiwagi was transferred to another world when he slipped down the stairs of his apartment and fell downstairs. When he was about to fall from the top of a tree, he was rescued by Leonard, the leader of the Second Royal Knights, and Leah, the vice leader of the Second Royal Knights. After that, Sota finds out that he cannot go back to his original world and ends up living in this country as the head of the knights' dormitory by chance. Just as he thought, "I will work hard as a dormitory head! Just as Sota was thinking so, he heard a mysterious tradition that "the matron becomes the companion of the head of the knighthood". In other words, he will be Leonard's mate...? And because of the "oath of alliance" that Leonard and Leah had exchanged, he will also become Leah's mate...? The pure and innocent saving boys and the spadari knights weave together in this otherworldly fantasy BL!

アパートの階段からずっこけて階下に落ちると同時に、異世界へと転移してしまった柏木蒼太。転移先の木の上から落ちそうになっていたところを王立第二騎士団団長のレオナードと、副団長のリアに助けてもらう。その後、元いた世界には帰れないと知った蒼太はひょんなことから騎士団寮の寮長としてこの国で生きることになる。「寮長としてしっかりと働こう!」そう思った矢先、蒼太の耳に入ったのは、『寮長は団長の伴侶になる』という謎のしきたり。つまりレオナードの伴侶になるということで...!?さらにレオナードとリアが交わしていた『盟友の誓い』のせいで、さらにリアの伴侶にもなることになってしまって―!?純真無垢な節約男子とスパダリ騎士ズが織りなす、異世界ファンタジーBL開幕!