Are you talking about the sea dragon?

Uh, there's a dragon, right? I'm on the episode where Nanami goes to the underworld. And oh ok cool.

Oh and his name is Mizuki.

He became her familiar. Now she has two! A fox and a snake. Plus there is another secret that I won't say. Teehee!

Thanks for the compliment, Pet Detective. I'm not as good as Numakenu and Mirotaki but I try.