She first transmigrated to another world and became a member of the dragon clan, but chose to immigrate back to Earth because she couldn’t get enough to eat.
Unexpectedly, an accident on the way turned her from a dragon guy into a dragon girl. Her older sister also went missing, leaving behind a little niece who calls her "Mama" every day: an impossibly cute little dragon girl.
Little Dragon Girl: "Uncle, you lost Mama. Until she comes back, your punishment is to be my Mama!"
The first step after returning to Earth: earn enough to support the family...