Why did you come to Japan? Just to stay in your dorm all day every day and cook?
Why did you come to Japan?
何故日本に来たの?
Just to stay in your dorm all day every day and cook?
毎日寮に引きこもって料理するため?
「毎日」は直訳的にevery dayになりますが、
「毎日部屋に引きこもる」を英語でto stay in your room all day every day(部屋に毎日、一日中いる)と言いますね。
ご参考になれば幸いです!