Eroge Shiyou yo! by Heat-Soft - Adult Sex Game

Three sisters live next door, they are not like ordinary girls...
All of them are madly in love with the hero, and are ready for any pranks and meanness for him.

You must keep this shameful secret and keep quiet...
I will train you to my liking and...
I want to be the hero's pet dog and I will come to seduce him!

Where will this mad love of sisters lead to a tragic end or ...