The game begins in 2001 with the player as a young high school student navigating daily decisions: how to spend each week and how to respond to the girls at school, with answers affecting character stats and relationships. Exams also build stats over time. Eventually, around the year 2003, the player discovers a mysterious time hole and is pulled back to medieval Japan. The game then shifts entirely into a first-person sound novel format, where the player can only choose from different responses to advance the story.