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Yayoi (the purple haired girl) has an odd expression in her art and a lot of her lines reflect that by having her say stuff like "don't be worried about me" or "I'm not angry" and similar.
The artist's title for this is something along the lines of "Ok, Yayoi's not angry!" with a subtitle that reads something like "Absolutely is angry pyon!" (Forgive me, google translate isn't the best tool to work with).
In the Kancolle fandom when ships share classes like Yayoi and Uzuki do, they tend to be related (like the Kongo sisters), close friends, or something more (Kitakami & Ooi).
In this case you can probably assume this is like being pestered by a sibling or an annoying friend ("Are you mad? You're mad right?" ) until Yayoi finally snaps.
So the title is essentially Uzuki saying "Ok! You're not mad!" in a sort of "I get the point please stop spanking me" kind of way.
edit: Forgot, the "Pyon!" bit is just a verbal tick Uzuki has. It means something like "just kidding". Since the description has it included it's clear that Uzuki's the one thinking "She totally is angry" and not just the artist pointing out the obvious.