Oh, he recalls Elpis now- his trip to the Underworld meant that he could recall everything that had happened there. But he doesn't recall Tsubaki. Perhaps they met in passing? But the other woman speaks as though he should remember her, and quite certainly he would have recalled those horns and tail of hers. He's never seen anyone with those before!

"My apologies, but I still cannot recall..." Which bothers him, because he feels rude for forgetting. "How did we meet?"

Perhaps this conversation is best had when they're both dressed, but with no clothing in sight all he can do is sigh and seat himself behind the remains of his chrysalis. How unfortunate...