Ginji said that Aoi found him at the shrine and gave him the ability to get rid of the miasma while eating.

Ginji was going to try to go to the ruins of the dragon palace where mermaids used to live. But there is a strong curse that clings to ayakashi has settled there, so the miasma weakens us even if we go there for a short time.

He said he told Aoi the story of the last mermaid and how she was known as the Shrine maiden of guidance and that she was the one who had raised them. She raised them to shoulder the ceremony of the being Umi-bouzu.
He told Aoi of the ceremony failure 300 years ago and how Princess Iso foresaw an unimaginable disaster to come and drew the disaster to her in the ruins of the dragon palace.

After that, ougon-doujin-sama came to this land, and she, who was the mistress innkeeper at Tenjin-ya at the time, built a new inn in this land, Orio-ya.

Ranmaru and Ginji worked hard to grow the new inn, and princess iso's successor Ranmaru became overbearing to Ginji. It was then I asked Ginji to come to Tenjin-ya. Ginji came and worked for me on the promise to return to Orio-ya in time for the ceremony.
Aoi asked him then if she could help and Ranmaru arrived suffering from the same impurities as Gingi. Aoi then went and got help and cooked Ranmaru some food.

When he recovered, he told Aoi to get the mermaid scale in place of Ginji as the miasma wouldn't affect her.

I waited for Aoi in the old kitchen and entertained myself by tickling her little turtle ayakashi.
Aoi comes in and asks, "What are you doing?"

"You're finally back, Aoi." Stopping tickling the turtle

The Turtle says, "Welcome back, Aoi."

Aoi ignores the greeting and says, "Master...have you been here all this time, by any chance? Don't you have anything to do?"

"I was waiting for you," I say, sitting up "since you worked hard yesterday, I thought I'd give you a reward for it, but..." I sigh. "You look like you took on another burden. "

"You can tell?" Blushes Aoi

"Cucumber! Cucumber!" Says the Turtle, "munch! Munch! Munch!"

And Aoi tells me of her task.

"I see, I see... you did take on a difficult task. "

"Ah, well, I'll be fine. I don't have time to be hesitant, either. "

I look at her in surprise. "You're nervous about going there alone, aren't you? Then I'll go with you." I say, getting up to get a drink

"Hm? What? Are you sure?" Aoi asks. "But that place is bad for ayakashi."

"I'm a completely opposite existence to Ranmaru and Ginji. " I say, "So I will be ok against the miasma in the ruins of the dragon place."

"Completely opposite? Is that right?" Aoi questions.

I then say, "Besides, even if I won't be ok, I'd still go with you..." Looking at Aoi through the cup of water. "because it's also a husband's duty to share his wife's hardships. " and smiles at Aoi, causing her to blush.

"Thank you," she says and takes the glass off me.