 If you liked
Kiseijuu
|
 ...then you might like
Zettai naru Isolator
|
Whilst one is a novel and the other a manga, what these two works have in common is that they both revolve around humans who have been infected by parasites. Each showcases fierce battles between human hosts, with Zettai naru Isolator taking a more superpowered approach. Both works are completely gritty and enjoyable.