During a peaceful meal with elderly residents, an alert signals the arrival of the Abyss Ruler, a world-ending threat undetectable by the Federation's weapons. The Abyss Ruler targets the group, seeing the vulnerable elders and a powerless mortal as easy prey. Despite warnings, chaos erupts when the intruder attacks, prompting the protagonist known as the Saint King to override restrictions and reveal his true form to defend everyone. As he confronts the intruder, his unleashed power promises a fierce battle ahead, leaving the safety of the elders in immediate jeopardy.