[Loner who can't communicate becomes the strongest player!] Kiyoshirou, a loner with no friends at school, has a hobby: the VR game "Central Sword". But one day, the game suddenly becomes reality, and a "gate" appears over Japan! Kiyoshirou will have to challenge himself to a life-threatening battle, in a world where cities all over Japan have been turned into dungeons! He will use his vast knowledge and weaponry, conquer one beast after another, and become known as the 'invincible player'. However, he has a fatal weakness... "I can't team up with anyone because I can't communicate!". What answers will Kiyoshirou find as he treads along the path of solo play to become the strongest player? -- A story of the strongest loner in a world where he can't afford to make a mistake!