Maougun no Messiah: "Seiken wo Tsukawanai no wa Yuusha dewa Nai" to Iware Tsuihou sareta ga Maou ni Horerare Kekkon shimashita. Ningen-tachi wa Ore ga Teki ni Mawatta no wo Koukai shiteiru You desu ga Mou Osoi desu

"Hey, why are you always pretending to be asleep?"

Miran Hanazuki, the most popular gal at school, often calls out to him, the bottom-of-the-barrel otaku, Shuji Nagasawa. He was confused by her flirtatious attitude, and then she unexpectedly declares that she's engaged to be his fiancee!? The beginning of a romantic comedy between two polar opposites, an introverted otaku and an extroverted gal!!

(Source: Kadokawa, translated)