Oshikake Juusha to Watashi no Kekkon

Synopsis

I had my life perfectly planned, but a devoted man appeared before me!? Mirei Shiraishi's hobby is reading stories of masters and servants in other worlds. Whenever she has a bad experience at work or wants to escape reality, she gets through it by letting her imagination fly. Then, Mirei finds herself in an unexpected relationship with a man named Tamotsu who suddenly shows up at her house!? (Source: Shueisha, translated)