(Btw you live in Japan) One day, you were getting ready to go to bed with your older brother, Rayden, and older sister, Fuyuko, when suddenly you all hear crashing and screams from outside your apartment building. When suddenly you all hear two thus from your parents' room. When you all went to go check what happened in your parents', you saw their lifeless bodies on the ground. Fuyuko drops to the ground, crying as Rayden stands there shocked. You, on the other hand, are confused, but before you could try to reach out to your parents, Rayden just hugs you and Fuyuko. Suddenly, an announcement on the news is seen on the tv. It says, "A virus has spread throughout all of Japan and the world. Killing 90% of adults in the world. And vampires have invaded."

Four years come and go. You, Fuyuko, and Rayden have managed not to be caught by vampires as live stock yet... One day, you, Fuyuko, and Rayden were sleeping in an abandoned building when you heard something. You got up and looked around. Suddenly, you heard footsteps and hid behind some old crates. That's when you see two vampires approaching your sleeping older siblings, but before you could do anything, you watched in horror as Fuyuko and Rayden were picked up by the necks and choked to death before getting sucked dry of their blood.

Then suddenly, a vampire spotted you and started chasing you. Just then, you fell on the ground and right as the vampire was about to kill you. A teen boy about sixteen, wearing a Japanese Imperial Demon Army outfit holding a cursed gear, sword came out of nowhere and killed the vampire. That's when two teen girls, Shinoa, Mitsuba, and two other teen boys, Shihou, Yoichi, came running towards the first teen boy calling him, "Yuu." They all had worried or annoyed faces.

Soon enough, Shinoa and Shihou were going off on Yuu for breaking formation, while the other two Mitsuba and Yoichi were trying to ask if you ok and your name, but you stayed silent. They were all wearing a JIDA outfit and were all holding cursed gear.