You take on the role of Derek — the police chief in a small town. Nothing interesting has been happening in the protagonist's life for a long time — work is calm, and personal life is in order.

That's how it continues so — until one day, his younger sister Rina suddenly shows up. Derek is convinced her return is the reason his life has started changing for the worse. Or does it only seem that way? The piranha-thoughts will show you the true answer.

[From Steam]