Naite Kurasu mo Isshō, Waratte Kurasu mo Isshō

Whether we live in tears or in laughter, a lifetime remains the same. At first glance, this idea feels almost too simple, perhaps even obvious. Life moves forward regardless of how we feel. Days pass, time unfolds, and the world continues its rhythm without waiting for our emotions to catch up. And yet, within this simplicity lies a quiet, unsettling truth: if life does not change based on our emotional state, then the way we experience it becomes our most important responsibility.
We often grow up believing that happiness and suffering exist as opposites. We are taught, directly or indirectly, that a good life is one in which pain is minimized and happiness is maximized. Sadness is something to overcome, fear something to silence, and discomfort something to avoid. In this framework, emotions are treated like problems to solve rather than realities to understand. But lived experience tells a different story.
There are moments when joy and sorrow appear together, inseparable. A farewell filled with gratitude. A success shadowed by emptiness. A quiet evening where peace and loneliness coexist without contradiction. These are not rare exceptions, they are the texture of human life. Yet we rarely have the language or the framework to make sense of them. This book begins with a simple but transformative premise: we do not experience emotions one at a time, we experience them in layers.
Pain does not cancel out happiness. Happiness does not erase pain. Instead, they exist simultaneously, shaping how we see ourselves, others, and the world around us. Ignoring this complexity often leads to frustration, the feeling that something is wrong because we are not purely happy, or not fully healed.