Nekoka Kareshi No Ayashikata

From Girls’ Generation:
Kokonoe is a werecat who turns into a cat when he is excited. Destiny has it that one morning, Kokonoe, runs into Natsume, who seems to have a special relationship with cats. With Natsume’s touch, Kokonoe soons finds himself purring and getting excited. However, Kokonoe is determined to keep his cat side and the feelings he has for Natsume under control.
How will their love blossom? A love lesson between a white coat school doctor and a werecat.