Pluto: Urasawa X Tezuka 2

Not much to add, well loved and understandably so.

Everything I've read by Urasawa-sensei is gold. He is amazing.

This is a more mature (as in adult-oriented, not sexually graphic or violent) take on an Astro Boy story. Bloody robots hitting you in the feels.

It all begins with the death of the world's most beloved robot. It's supposedly an accident, but someone is actually going around murdering robots. And Detective Gesicht–also a robot–is on the case.