The Delinquent Housewife!, 1

A family comedy manga about a high school boy and his sister in law who moves in.

High School sophmore, Dai Komukai meets his sister in law Komugi, who moves into the Komukai household. After his brother leaves for a business trip, Dai senses something weird with his sister in law. Outwardly nice and cute but Dai finds out that she actually can't cook or do laundry! And then he finds out another big secret....