Gyakusatsu Happy End

High school student Kusakabe Makoto spends his days working tirelessly to afford treatment for his younger sister, who is battling a serious illness. With an unemployed father and a mother who abandoned the family, Makoto endures relentless hardship—including bullying at his job—yet refuses to surrender to despair, living solely for his sister’s sake. However, when he learns that her time is running out, Makoto is plunged into utter hopelessness. Confronted by the terror of the unknown, he begins to see the value of human life through an entirely new lens.