Review Detail of Cloudelka in Tales of The Mighty Dragonair

I'm towards chapters 30 at the moment, but i'm a little lost! Reincarnation in the body of another person in another world, the father is happy that his "son" is not dead and the doctor says he must rest. The MC says he weak, but *POF* 5 seconds later in great shape, he go buy a weapon, make companions and go on an adventure without telling anyone, whut?