Now to start of, since i give my (personal) scores solely based on my enjoyment, on my list this manga gets a 10, since him enjoying it that much. Since this is a review for everyone, i'll try to be more "formal" in a way.
Lets start with the story, the setting itself is almost cliché, but that doesn't necessarily make it bad, just rather overused, but then again, nowadays i find it almost impossible to have something original, theres just that much content. The plot is simple, vampires manipulate a virus that wipes out everyone who is 13 or older, our MC is a young
boy who was under the age of 13, gets taken by the vampires to be a living blood bag, manages to escape eventually, gets all is friends wich were like family killed by the vampires during said escape and vows revenge. There are already some misteries developing that shall not be said here to keep it spoiler free, they seem rather interesting as of now. Now, even if revenge stories have been used alot, its still a solid way to tell a interesting story if done right, but since its overused i gave it a 7.
Moving on to the art, in all honesty its f*cking amazing. Aside from very well drawn characters, the backgrounds are amazing. Who can clearly tell what is going on during fights, wich is a big plus so you can actually understand what is going on. There is something rather wierd however, i dont know why but the MC is depicted with a green demonic sword and then a red demonic sword, so either the author decided to change colors or it was a mistake ? I dont really get it but its something so minor it can be ignored. Overall, i give it a solid 10.
Now we get to the characters... Its really hard to talk about characters without spoiling something, so i'll keep it brief.
The main character wants revenge on the vampires who took is family, he is obsessed with power in order to kill them. He is kind of a tsundered (yeah, male lead a tsundere ? i found that rather funny tbh.)
The main female lead is a teasing, playful high ranking officer of the milatary around the MC's age and his from the most powerful family in Japan (the current destroyed Japan, that is). She is a refreshing character, always with a smile, teasing our MC, they have some good interactions to be honest.
Other character come along the way but i'll leave them to you so you can find out for yourselvs. Overall i give the characters a 8.
Now, as stated before, my personal enjoyment of this series is a 10. Yes, the story is cliché and overused, but i like this kind of stories, the art is absolutely amazing, the characters are very well written and a breath of fresh air when compared to the overused stupid main lead and the tsundere female lead. I expect good things from this manga, since i've only read 18 chapters so far i still cannot say if its good or not, but i've enjoyed it so far and hope to read more.
Overall i give this series a score of 8, since the story is indeed overused and i dont believe it to have enough chapters to give it anything higher when speaking outside of my own personal opinion, in the end its up to the people to choose if they want to pick up this manga or not.
With this, i bid you all farewell, i thank you all for taking the time to read my review and hope you enjoy it.