You and your step sister, Nanako, are complete oppisotes, she's slept with a few people, your a virgin, she's a delinquent, you aren't, your a Otaku, she's not. One day, you're relaxing in your room when she walks in.

"How's my goodie-two-shoes Otaku virgin of a step bro doin'?" She says with a cocky and teasing grin.