Tsugunai

Our protagonist, a young man with a deep sense of justice, lives with his caring sister Nana after tragically losing their parents in an accident. They've grown up sharing both happy and challenging experiences together, forging an unbreakable bond. However, their peaceful lives take a dark turn when Nana is brutally assaulted by a group of wealthy men, leaving her traumatized. Fueled by anger and the desire for retribution, our hero decides to teach these immoral individuals a lesson. He takes up a job as a high school teacher where the daughter of one of the rich men - Ruriko, who worships her despicable father, studies. Seeing an opportunity for vengeance, he lures Ruriko and her friends to a remote villa under the pretext of extra classes. As their guard down, he seizes this chance to unleash his wrath upon them. Will our protagonist succeed in bringing justice to those who wronged him and his sister?