the book is about this kid named ichigo and he has the abillty to see gohst and people called soul reapers and he meets a soul reaper after his family gets attacked by a hollow( a soul that could not go to soul socetiy until ther soul was put to rest). and the only way for him to beat the hollow he had to become a soul reaper.
quote from story
"do you rember what i said when the fight began? that you wanted to protect wasn't what I wanted to protect? ( kubo 32 )
" Yeah what I wanted to protect was you" (kubo 32)
ichigo and his zampakto in its tensa zangetsu form during there battle