Leaving a comment here to remind myself not to waste time with this garbage again. To anyone else, just grab your self-respect and move on, unlike the uke in this story. I've read a lot of trashy stories (not by choice, mind you) but this gotta be a new low, the kind that makes you curse out of frustration.
This manga is missing comedy in the genre. The demon is absolute madlad. If nothing else, you can read just for the lols.
The funny thing is his name is "Eigo" which literally means "English". Would be kinda ironic if he sucked at it.
Low-key kept reading it as Ego