You are a young man who has a job and lives independently in a big city. That summer, your younger sister from the countryside passed the university entrance exam in this city and came to live with you. Nemurimouto will present an emotional story where the player can make many different decisions. Up to now, the player has had more opportunities to get close to this younger sister. So many stories will happen, and you have to face life with only 2 people. Two different genders will lead to many conflicts, and that is also an opportunity to understand each other better.