kinda lost here.. who is kotoka?
This scan group is all over the place with naming characters, even though the name readings are given for each character...
For example, in chapter 6 they call Maya "Mayu" even though the reading "まや" is given in the raw and on the website character listing. In chapter 3 they call her "Shinjo" for some reason.
I could be wrong, but chances are that Hana/Kotoka are the same and the scan group has messed up.