These two are just so perfect together.
And if the official guide book is to be believed, Rikka is from the real world as well. And because Rikka's Mama is a Hyper Agent, she must have taken her to the computer world.
It'd make sense given that Akane and Rikka are the only characters with unique eyes in the series, and Rikka's Mama has yellow eyes. (Just like Gridman and Alexis, the other two characters from the hyper world.)
So, hope's not lost that they can be together.