
So the pigtail girl is the sister of the main character but the does that mean they have the same dads or different because if they had the same wouldn't her dad at least know that unless it wasn't his child or when the mom "died" she was with child
This manga leaves me in so many questions
Also when the mom was in costume did anyone feel the creeps or think it looked like a villain from scooby doo

Did his dad become a woman during the ten years or just in the wedding day because I feel it was just on the wedding day

Asuka's dad became a woman over the years, but had his big coming out in the wedding (●'◡'●)
At least that's what I think since the reason he hadn't done it before was guilt for leaving them (=・ω・=)

What it says it's completed but the last page says to be continued

That's because there's another chapter. http://mangahere.io/ouran-high-school-host-club/ouran-high-school-host-club-83-7.html
I feel like the reasons why he doesn't remember and she is in hives when people touch has something do with eachother