The great journey of the Katuri family in search of a new home begins!  The forest which had been peaceful for mother Katuri and her four children became dangerous due to an apartment development so they hurriedly decided to move away after leaving their beloved nest behind them. They have to pass by the middle of the city to get to the mountain. With the help of the mouse family, they fortunately found shelter for the night, but only for a while... While the mother scolds the street cats in the city, her children disappeared, and the mother who is looking for their children is also in great danger...  Will the separated mother Katuri and her four children arrive their new home safely?