It's been two years since your father remarried and you have a new stepsister. Your sister Alya has taken over the garage and practically lives there. She's constantly tinkering and inventing new things. Since your electricity bill is "for some reason" suspiciously high, your parents work a lot, so it's mostly just the two of you in the house. You're the only one who understands Alya's perverted personality and you're pretty much her only friend.