Genkai Otaku ga Gisou Koibito Hajimeta Ken

Yumekawa Moe pretends to be normal at work when in reality she is a hardcore otaku inexperienced in love, her ideal boyfriend being her MMO character "Fantasista・Yukimaru". That was until one day, Yumekawa encountered her co-worker Kusakabe Chiharu who looked exactly like him, as he was being bothered by his boss to attend a marriage interview. She promptly jumped into the conversation, unknowing that Kusakabe was also hiding the fact that he was an otaku! Through a misunderstanding, the two ended up being confused for a couple, but somehow decided to keep up the act in order to preserve their current way of life...!? WIth that, their "fake relationship" has begun. How long will their secrets last!?

(Source: Kadokawa, translated)