Its honestly kinda wild they completely brush past both the age gap and homosexuality of it all. No "we're just girls" here!
I mean I'm not THAT surprised Yuuka doesnt bring it up. She's an air head. Who knows whats going on in there. But Aika is actually serious and a little wise for her years so you'd think she'd connext those dots, but nope.
Its cute as hell, though.