After a bit of being messed with.

"Ah, as I told Aqua here, I am Ria, an Erokami," Ria replied to Kazuma.

"Yeah, that much, you already said!" Kazuma shouted, pointing at Ria with an annoyed look on his face. "What I meant was, what the hell is an Erokami, and why is one here!?"

"Oh, that," Ria mock realized, getting Kazuma's eye to twitch. "We're Sex Gods of a sort," Ria told him.

"Okay, that much I could have gathered in my own... Are you the one who dropped the Sex Note here?" he asked.

"Kazuma, who are you talking to?" Megumin questioned as she stared incredulously at him.

"That naked woman right there!" Kazuma pointed.

"Who, Aqua?" Megumin asked, Aqua being the only naked woman around.

Kazuma face palmed. "...she can't see you, can she? Why the hell is that? And why can Darkness see you, but not Megumin?"

"Guess," Ria grinned.

"Only those who have touched a Sex Note, or beings close enough to gods and goddesses can perceive them all the time," Aqua explained to Kazuma. "You're apparently the current owner of the Sex Note, Darkness must have touched it at some point, and despite being in a mortal body, I AM a goddess, so the three of us can see her, but Megumin is left confused."

Megumin blinked. "So the three of you are talking to an invisible woman only I can't see, who's related to the Sex Note?"

"That sounds about right," Darkness nodded.

"...way to spoil my fun," Ria pouted at Aqua.

"Can it Erokami!" Aqua pouted right back as Kazuma quickly went to his clothes and started digging for the Sex Note. "Why are you even in this world? You're trespassing!"

"Actually, I do in fact have permission to be here," Ria yawned. "The Goddess by the name of Eris made contact with me as I was passing through, told her if I wanted to make things more fun in this world, I could go right ahead... Took some of the fun out of winding up the local gods out of it, at least until she told me of your situation, and thought having me running around while you were down here was a hilarious prank to pull..."

"...I'm going to KILL Eris!" Aqua growled. "I'm her superior, damn it! She didn't have the authority to let you in!"

"Actually, in your absence, she does," Ria sniggered, getting Aqua to deflate. "I like her though, she's not like most of your stick in the mud goddesses."

Kazuma blinked at that as he grabbed the Sex Note and held it out to Megumin, who put a hand on it, then blinked as Ria came into view. "...okay, that's interesting," she admitted.