I'm No Saint, So I'll Become The Demon Lord!

Rina Amakusa is exhausted from her job at a black company. Guided by a voice, she enters the world of the game she loved and becomes a saint. She repeats the loop and tries to save the world, but when her beloved character is killed, her love for him turns to hatred. When love and hatred change her from a saint to a last boss, the "revenge" otherworldly fantasy begins!