A stone-cold classic! Highest Travelling Man recommendation!

Shinichi is wracked with guilt and paranoia over his monstrous transformation, and the human detective sniffing around isn't helping his nerves. Struggling to protect his human sense of integrity amidst monsters imitating human behavior more and more closely, Shinichi's relationships with his friends and family grow strained and distant. Will Shinichi be able to stand for what's right, and fight back against cleverer monsters than ever before?