Hi, I'm looking for a manga where a novelist takes in her nephew to live together.

The novelist is a woman in her 30-40's (if im not mistaken). One of the character in the novel she wrote was named Ruby. She didn't have really good relationship with the mom's nephew (her sister) but takes good care of the nephew.

The nephew is a middle schooler who just lost her parents in an accident (they don't actually married, just living together).

That's Ikoku Nikki (YAMASHITA Tomoko) .

Thanks a lot!