[It kind of explains something, but it's still weird. But they're also idols. That's literally their bread and butter. So maybe it isn't that weird, not really.

HiMERU tilts his head at the appearance of a second cake, though.]

This one is from Amagi...? And then you wanted another from the island?

[It's not a hard puzzle to put together at all. HiMERU chuckles.]

HiMERU deduces that either the flavor Amagi chose is not to your taste, or you're planning to distribute even more of your birthday cake with your island friends. Like Shiratori, yes?