In the Ichinose household, three sisters live together. The oldest,
Hinano, is pretty, friendly, and easygoing. However, she's also rather
messy and lazy in her personal life. The middle sister, Ichino, is stern
and easy to anger, but she's incredibly hardworking and does a lot of
the chores and cooking around the house. The littlest sister, Satsukino,
is a lovable little girl who adores animals and wants to be a vet when
she grows up. Together, they live with their frightening, listless,
abusive mother.
One day, Satsukino takes in a big, fat, talking
cat. After the three sisters convince their mother to let them keep it,
they name it Tonnura-san. But what is this mysterious cat, and where
does it come from? How will the lives of the Ichinose girls change now
that they've accepted Tonnura-san into their family?
