A young boy named Mikazuki Kenya was abandoned by his parents, bullied in high school, and left in solitude. At the brink of despair, he encounters a fateful meeting in his only hobby, VR gaming. A meeting with Kaguya and Reina, the heroines from the immensely popular game Knight of Giant. The time spent with the two heroines saved him, and he was head over heels for both of them. However, in the story, one of them is destined to die. To change that fate, he dedicated his life to mastering the game and becoming the strongest in the world. Suddenly, Kenya finds himself entering the world of Knight of Giant?!