Miyuki is an honor student and member of the School Drama Club. She is described as a high school idol with little to no imperfections.
It's initially assumed that Miyuki is obsessed with Shinichi, the protagonist. However, Miyuki reveals that she's actually obsessed with the player, aware of her existence as a visual novel character. She believes that since they played through her route first that it must have meant that they genuinely loved her. When she says "YOU", she refers to the player.