Reincarnated in Mushoku Tensie with unique skill awakened spellbook

Charlie a 14 year old boy that was diagnosed with brain cancer since he was four was been in the hospital all his life until he died. But when he was at the mist of his death a massage appeared to him { Soul detected initiating skill bound } { Skill bounded: Unique skill Awakened spellbook } Once charlie saw the message he easily drifted away by the darkness unaware of his fate