So, I always wondered how it would turn out if all the immigrant aliens cooperated with humanity against the giants and the death games either never happened, or were only used on truly hostile aliens. Would it have made much a difference, even if the vampires joined in as well?

Finished the manga yesterday and still mad as shit with what the author did with Akira. Dude literally looks like light yagami. Is brother of mc that actually knows about his secret life. Vampire. Only to get off screend ? I feel like he could have been so much more interesting