From Renta:

Newly hired kindergarten teacher Atsuko Minamino tries to rescue a cat, Kosuke, who's lying unmoving by the side of the road... but she gets mistaken for a cat thief! The misunderstanding is soon cleared up, and the cat's owners treat her to dinner at Pub Kitajima in apology. Atsuko's happy that Ryo Kitajima, the pub's owner, is her type?handsome but sad. He even makes Atsuko food to help her health condition. So, Atsuko can't help but get excited. Not only that, but Ryo's son Toma attaches himself to her. When Ryo smiles and asks her to come again, she can't stop herself from falling in love. This is a love story between a teacher and a single father.