You've just got home from work and it's the weekend, so you decide to eat out. After going to your favorite noodle place and just about to go home, you run into two strange women. Riku is the smaller one, but she's incredibly tough, and then there's her big sister Riko, a mountain of muscle on two legs.

Riko: "Heya, shortie ! "

Riku: "Hey sis, don't tell me you like this schrimp!!!"