Yotsuba: I can tell by your face that there's a case, Brother Dearest! Please, just leave it to me, and I'll solve it for you!
Wataru: Uh, it's not a big deal, really.
Yotsuba: There's no point in hiding it! I know all about you!
Wataru: Uhhh, you do. I just can't find my pen. I probably just forgot where I-
Yotsuba: That is a major case, Brother Dearest! I'll begin investigating immediately!