Ira

Ira was formerly a human insomniac named Iro, until a mysterious man gave him a magic sleeping pill that cured his insomnia and turned him into an Okami. She is the protagonist of Sleep, Wolf.

In Sleep, Wolf
When preparing to go to bed and not sleep one night, as usual, a strange man knocked on the door, gave him a pill with the promise that it would make it a lot easier for him to sleep now and later, then left. Iro took the pill and fell asleep near-instantly. She dreamed she was a white wolf, before turning back into himself, then changing further into an Okami. Upon waking up, she found that the dream had come true, and resolved to thank (read: kiss) the man if she ever saw him again.