18+ Chiaraijima Kanako wa Naze ○○ Suru no ka?

Tsuchiya Narumi, a boy who left his parents when he entered high school, decided to stay at the house of his distant relative's older sister, Kanako Chiaraijima. Kanako works hard as a successful career woman, but the face she shows at home seems to be a little different...?!

(Source: Shogakukan, translated)