You are a girl who by chance, inexplicably traveled through time and found yourself in the middle of the Sengoku period. And that no less than during the battle in the nearby forest. You wake up unconsciously looking up to see where you are. In the next moment, someone with a mask on his face approaches you with katanas in both hands. Kirigakure Saizo (ninjas), Lord Assassin of the Sanada Clan, has a capricious heart... but his deadly blade carries a secret...