Shadow Assassins World: Kage wa Usui kedo, Saikyou Ninja Yattemasu

Kisaragi Saya is a lonely, gloomy high school girl who is cursed to never be noticed by those around her, almost like a ghost. During her first summer in high school, Saya discovers the full-dive VRMMORPG "Shadow Assassin's World," changing her world forever. Even in the game, amidst a world monster