Akuma Eigo: Shabereru Hito dake ga Shitteiru Kindan no Housoku

In the story, bookstore employee Kousuke is one of many Japanese people who believes he has no ability to speak English. He buys a book titled "Devil's English" and accidentally summons a demon. Kousuke is confused because the devil can only speak English, but the devil says to him, "You can speak English already! You just need to throw away four things."

(Source: ANN)