Days spent with my niece v.1.03 / 姪っ子と過ごす日々

Suddenly, I live with my niece.
Days spent with my niece [Ichie Kobo]
The main character lives alone in a single house.
At night, the phone from her sister rang as she was working from home.

When I heard her talk, she told me to take care of her daughter (her niece) for an overseas business trip.
Her phone will not be hung up before she refuses ...

I haven't met her niece since she played with her when she was little.
What will happen to her ...