Gyakushuu ~Seiheki no Bigaku~

Main character loses his parents in an accident and lives in his relatives family - uncle, aunt and their three daughters. He remains cold to the family and eventually starts to be treated as a housekeeper. The only joy for him is internet. One day he molests a weak girl in the train. With first crime remaining unpunished, he sets up insult hell for his three new sisters...

[From vndbreview]