Shinmai Shimai no Futari Gohan

"But suddenly, I had a little sister. That was the problem."
After her father's remarriage, Sachi suddenly has a new stepsister, Ayari. At first, their interactions are awkward, and very brief. However, they soon discover a shared love... of food?
Sachi soon discovers Ayari's passion for cooking, and the two step-sisters soon begin to ...