Godou Kusanagi, a 16-year-old, unexpectedly becomes the God Slayer after defeating the God of War. As a God Slayer, he must fight Heretical Gods that disrupt the natural order, putting innocent lives at risk. This new role brings challenges, including unwanted attention and complicated relationships with girls like Erica Blandelli, a skilled sword-mistress who harbors a manipulative attraction for Godou.

The origins of Godou's extraordinary fate are revealed, as he recounts the ev...