Seiichirou Kondou is a 29-year-old accountant and major workaholic. When he's accidentally transported to another world, not only does he demand a job, he starts whipping the lackadaisical Royal Accounting Department into shape! But when he gets in over his head and nearly dies from overwork, the handsome Commander Aresh steps in to save him, and the two develop a unique, physical relationship...as a form of medical treatment?!

After getting accidentally summoned to another world, former office worker Seiichiro ends up becoming extremely close with the handsome knight commander Aresh—although what exactly that means remains ambiguous, even after they begin living together. Just as that’s happening, Seiichiro meets a priest who reminds him a bit of Aresh. When Aresh returns from his latest expedition, will he find a rival waiting for him?

聖女召喚に巻き込まれ、異世界転移をしてしまった社畜の近藤誠一郎。 年下の騎士団長アレシュに窮地を救われ関係を持ったことから、なんやかんやと世話を焼かれるようになり、いつしか恋仲に――。アレシュの気持ちに真剣に向き合わなければと思いつつも仕事に忙殺される中、エゴロヴァの第三王子率いる使節団の案内役に任命される。ところが、その歓迎パーティ用にアレシュが誠一郎に用意した衣装が周囲に波紋を巻き起こし、喧嘩になってしまう。仲直りできないまますれ違いが続いたある日、アレシュに婚約話が持ち上がる！　帰還魔法の完成も現実味を帯び始め、誠一郎と優愛、それぞれの選択は………？　『異世界BL』第３巻！