Class de Ichiban Kawaii Gal wo Ezuke Shiteiru Hanashi

Sakura Kouzuki, a top-tier gyaru who's the star of the class and even works as a reader model, and Houri Kazami, who prefers talking otaku stuff with his comrades in the corner of the classroom. These two, who seem to live in completely different worlds, are actually step-siblings—and secretly live together as a couple. And none of their classmates know the truth. While Sakura sparkles at school, once she's home she relaxes completely and falls head over heels for Ori's cooking. And Houri, who’s in charge of meals, doesn’t mind one bit—— “Simmered fish is sooo good~♡” “Onii-chan's cooking really is the best~!” A sweet and fluffy feeding story about a cute gyaru and their double life at school and at home!

(Source: Square Enix, translated)