"Shared House - I'll Keep Watching Today" is a mystery-solving and surveillance novel game. In this game, you live with six male and female roommates. One day, you are attacked by an unknown assailant among your roommates. To protect yourself, you must continue your surveillance.

The main objective of the game is to monitor your roommates' actions closely to identify the attacker who targeted you. You can choose between two actions: surveillance to observe actions and eavesdrop on conversations, or direct interaction with roommates to gather information.

Be wary of your roommates as they may unexpectedly visit your room. Your choices during various actions may have life-or-death consequences. After surveillance and investigation, you must strategize to protect yourself from potential harm based on the evidence and information gathered.