"You don't need to know Japanese, just have good grammar!" Yeah, that's obvious. Seems like the second part is optional as well.
Edit: Was the letter on page 19, looks like it was updated.
The thing that pisses me off the most is that she knows where he is and hasn't told any of the characters with two functioning brain cells, just cause of what the bitch maid said. Also the cartoonishly evil villain.