Kirito Or The Real Name "Kazuto Kirigaya" Was In Coma Due To Someone Inject A Syringe To Him And Make A Tiny Chance For Him To Get His Consciousness Again And Then Kirito Was Taken to a advanced tech such as STL (Soul Translator). And The STL Successfully Create A Fluctlight Of Kirito's Mind And Soul A.K.A His Soul Was Copied Into A Digital Intelligence, And You As A Scientist To Manage This Fluctlight And Keep It Safe From Any Damages