I think it's interesting to note that in all the pics you can see Aika is putting all her weight on her right leg.
In the group swimsuit pics, Aichan even seems to be holding her up a bit.
Then in the poolside pic, you can actually see her ankle brace.
In the group shot with normal clothes, she's actually hiding her left leg behind Reina.
And can we all just agree that everyone is looking good?
Sure Fukuchan and Zukki are probably covering up a little due to plumpness, but they're both still lovely!
Besides, being a little heavier now is like an investment that pays off in the future, if ya know what I mean.