Fumi Nagasaka’s insightful monograph “Untitled Youth” delves into a thing we’ve all experienced in life but often forget: youth. Through the art of portraiture, Nagasaka unveils a secreted reality, rarely experienced by outsiders. Her teenaged subjects visibly waver between adulthood and childhood; they are, as of yet, “untitled,” and that’s what makes them so compelling in front of her lens — each photograph, tinged with a sense of hyper-potentiality and pained desire.