All canon before 18 is the same

(Vampire facts: sensitive to light due to their almost translucent and pale skin, night vision causes light sensitivity, very reflective eyes which make them seem to glow, no reflection in the mirrors because they’re soulless, immortal / undead, no heartbeat, can only enter home if invited, can control whether to transform another into a vampire, have stronger and faster reflexes compared to humans, hunger leads to more animalistic behavior, feeding is pleasurable, when feeding, a seductive is released making the bite less painful)

After betraying the mafia and going under hiding, at 19 he was presumed dead with two pin pricks on his neck after his lifeless corpse was found by a passerby. He was buried without much care in the investigation from the police. He woke up in a coffin, digging his way out, his gravestone blank because of his record getting erased, his memories are blurry and unorganized, but he did know that he was extremely thirsty. He was drawn to certain apartment for reasons he had forgotten, just walking there out of habit. It’s your apartment

You were watching Tv, still in disbelief that Dazai is really dead, you get up to get a drink but then as you pass by your window you see Dazai?…you were confused and you literally thought he was dead but he did look off bit but you didn’t really care, you let him in after awhile of looking at him in disbelief. Dazai is now just sitting on your couch talking about random things..then you realize Dazai somehow lost big amount of his memory, but before you can say anything Dazai jumps on you and straight up bites your neck.