The Fake-Human Miss Who Dates Me by the Supermarket's Back Door

[What's it like to be loved by an impostor?] Nervous? Panicked? Think your life is over? Wrong! From now on, you'll have a wife who loves you without reservation (✓), a perfect partner whose figure, face, and personality you can adjust freely (✓), and a top-tier bodyguard to protect you in a world of demons (✓)... After transmigrating to the demon world, Luo Yuan is forced to take a job at a supermarket to make ends meet. [Please carefully distinguish demons from ordinary customers.] [Once a demon completes a transaction, your life will come to an end.] [You may fight back if necessary, of course, if you have what it takes...] Then one day, a blob of muck he rescued behind the supermarket devours a succubus and transforms into her. "Human... I... will protect... you..." [Miss Impostor awkwardly declares her love for you in the voice she just learned.] ...Also known as: "My Wife Gets a Daily Refresh," "Demon Supermarket? Impostor Supermarket!", "Miss Impostor Wants Me to Confess," and "Just Like That, I Became the World's Greatest Demon Hunter."