Helel, Vampiric Dragon!

Helel was just an ordinary young boy with nothing noteworthy about him. Suddenly! Helel had a serious accident. Helel spent years in a coma until he finally died. But! This was not the end for Helel! Some Being: God. Buddha. Cosmic Being. Transcendent. Gave him a chance. However. It doesn't matter who gave him that chance. The only thing that mattered to Helel at the moment was how not to go mad from insatiable hunger. Helel was not alone... [Ding! Scanning...] [Ding! Scanning Complete!] [Ding! Starting system installation...] [Ding! Installation complete!] [Ding System successfully installed!] ________________________________________ ※Warning: I'll be telling this now. The fanfic is going to be a mess. Don't expect some otherworldly complicated plots. They could be total garbage. I've never written a non-human mc before, so this is a totally new attempt.