ネトラレンサ～キモオタニートの叔父に最愛の妹を寝取られた俺～

"Oniichan, please come home soon. If you don't..."

Takumi (you, protagonist) and his younger sister Anna lost their parents in a car crash. When they moved in with their uncle Hiroshi, Takumi instantly disliked him. For some reason Hiroshi took a liking to Anna... Spurred by his uncle's advances, Takumi realized that Anna was the only woman he ever wanted. He kissed his sister, and she, in turn...