@Jaelyun
I also think that Aku is a girl, but I think It's weird how the author is making so much suspense on what is Aku's actual gender.
The MC truly believes that Aku is a girl, and Aku never said otherwise when the MC bought the girl clothes. On the other hand, the shotacon lady never said anything about Aku's gender even after examining Aku, and continues to fawn over Aku as If Aku is actually a boy.
And as far as I know, Aku wearing girl clothes doesn't really confirm anything, specially considering how much love some japanese people have for "traps". lol
I'm not sure what the author is intending on hiding and making us doubt Aku's gender, so I'm personally thinking about Aku as a adorable, mysterious and genderless being for now. lmao
But as I said on a previous comment, It doesn't really matter for me what Aku is, since Aku is just a kid. And since thankfully this manga doesn't have either a
romance or a
harem tag, the gender of the people around the MC is even less relevant in my opinion.