Radio and Apollo are in an "Open Relation" with one another, since Radio is a hound dog and Apollo travels a lot, though when he's in town she gets very touchy/clingy/possessive of him. I hope Ieno knows what she's getting herself into, but, then again she's just as bad as Radio so I'm sure she's just pushing Radio's buttons to see how far she gets before a fist rearranges her face.
Character(s) © RadioCatastrophe & Nathavin
Artwork/Artist © The Jotaku