The Last Support Class

The story begins with an overused cliché. The main character, a 16 year old kid name Kayne, gets reincarnated. From there the first ten years pass in a blur with him getting very close to the family that raised his reincarnated self. On his tenth birthday he learns that his class in a support style which leads to him being looked down upon. 8 months later the world goes through a cataclysmic event. Everyone must pass a trial in which the failure is death. After Kayne's sister saves him by using her life and abilitys as a hero, Kayne realises he is the last surviving support class. I am no professional, so don't expect perfection. However I will try to keep the story interesting. Advice is apreciated.