I Have Support in Sword Art Online

They say Grandpa Tong has a cheat and is invincible in the world of swords? I also have one... An auxiliary that seems useless? I, Higasumi Kiyokawa, came to the world of Sword Art Online because of some supernatural system power. How can I survive in this death game? Ps: This book has many original plots, but the general trend is to follow the plot of Sword Art Online Attack. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.