While the other heroines are making Saotome uncomfortable by fighting over him, Hanako is thinking how to help him.
This is just the author reminding us whose name is in the title and who's gonna win.
That's true. Hanako proves once again that she is the only one who deserves to be with Saotome. Because she is the only one who cares about how he feels, the others don't give a damn. They want to go out with him, but they only think about themselves. They think he is relaxed and enjoying the trip because they are monopolizing his attention, when in fact that is not the case at all. Hanako is the only one who cares about him, of what he can think.