At O'Brien High School St. Club, when Hikaru says it's Caro, what's it?
Ah, or on DVD, it has the same name as me, which means who is in charge. Basically, Hikaru was asking why Kauro is seen as a dominant or bedridden person in their relationship.
It basically means why you will be the leader. Or if you know what Sam and UK are, then of course Ryan Koro gave Sam and Hikaru the role of OK.
Exactly as stated in the previous two answers. In other words, if Caro and Hikako loved, Caro would make Hikaku.