Love wa Gal kara Hajimaru Unmei

Ayase Gal wa Boku ni Muchuu: Okaa-san mo Maze nasai yo

Ayase Miki, a gal student on the verge of repeating a year, ignores her homeroom teacher Sakurai Makoto's warnings. Realizing the situation won't improve without involving her parents, Sakurai pays a home visit. There, he's greeted by her busty mother, Minami. Instead of listening seriously, the mother and daughter start competing, each claiming her own body is better.

(Source: Getchu, translated)