In this paper, we examine the connectivity and digitalization affecting our private lives through a case analysis of Pokémon GO, a game application for smartphones. First, we outline the concept of sociomateriality as a keyword to consider the effects of Pokémon GO. Subsequently, we explain the outline of the game Pokémon GO. Finally, we show the usefulness of sociomateriality for examining the impact of digitalization on our private lives, using the example of Pokémon GO.