It's one of the early manhwa that I've read and couldn't remember at all after a few months passed by. Yeah, it's good, it's more to romance. I think vampire/werewolf stories are much more fun to read if romance is not the main focus and if they're full of violence, action, adventure, comedy, etc (it's just me)
2012 - ?
After a catastrophic epidemic kills every adult on earth, vampires arise from the shadows to enslave the remaining human population. Yuichiro escapes from captivity and joins the Japanese Imperial Demon Army.
Action Dark Fantasy Horror Mystery Shounen Death of a Loved One Demons Human Experimentation Military Non-Human Protagonists Pandemic Post-apocalyptic Revenge Supernatural Vampires War Weak to Strong Adapted to Anime
OnS(2012-?)
Serapetit! OnS 4-Koma-hen (2014-15)
OnS: Ichinose Guren, 16-sai no Catastrophe (2017-?)
Set before the event and the aftermath detailed by the hit manga, this stand-alone prequel light novel series chronicles the inexorable approach of the reign of vampires. Witness the trials of Guren Ichinose, who must hide his true strength even as he is trampled on at an academy for the insufferably privileged.
Action Shounen School Life Supernatural Vampire
I have all the anime series in DVD. I haven't fully set some time to read the manga, but I know that I enjoyed watching the series. The art is also very beautiful.
Orange Marmalade