You play as Shinya, who was feeling reluctant about his mothers remarriage, but it wasn’t like he had much choice in the matter (she’s always been an over-working career-woman). Your new father, who owns a brewing company/warehouse, decides that you shall take over the family business whether you like it or not--seeing since you’re the only son of the new family. Sure their intentions are good, but it’s still a hassle. At least your new step-sisters turn out to be cute twins, so we suppose it isn’t too bad. It seems that the only thing you’re in control of in this new setting is which girl to go out with; will it be the class-rep (who’s family runs a restaurant in town), or her best friend (who’s the daughter of another brewing company owner), or perhaps you’ll go for something even kinkier such as the twins?