Where are the uke's parents? I don't remember the story mentioning anything about them,

i'm pretty sure mom has been dead since childhood, dad is somewhere else working to provide money. but the dad is gonna die later on according to the prologue (chapters 0 and 1)

His mother devorced his father and remarried when he was 14. He lives with his father, a construstion worker who works in the province but he hasn't come home in a while. ^-^