Imouto to Osananajimi no Seido Shidou ~Kore Ijou Naka ni Dasu no wa Yamete!~

Our protagonist is fed up with his father, who keeps getting fired from his jobs due to his heavy drinking.
Since his parents' divorce, he has struggled, which has led to him becoming cynical and being an outsider in his class.

Three years ago, his parents reconciled and he was reunited with his younger sister.
His sister diligently takes care of him, which warms the protagonist's heart a little and he becomes attracted to her.

However, the woman in question is his own sister, and he is left confused.
Then, his sister happily announces that she is marrying another man, and something inside the protagonist breaks.

On the day of the wedding, his sister is in her wedding dress, crying tears of happiness, and the protagonist takes action.

And so, he decides to take his sister away...