Based on the game by Biscotti.

What is the best seinen anime in your opinion?

Naoki Urasawa’s Monster Don’t get me wrong, Ghost In The Shell & Parasyte - The Maxim are high up on my list.
But monster, just wow.
From its concept Kenzo Tenma saves a child who grows up to become a killer.
To the fact that this single action destroys his life for years. Right down to Urasawa’s choice to set the whole story in Germany.
All of it is so far from the typical anime.
And everything is handled in a grounded and realistic manner, rather than the over the top nature anime is so well known for.
Its 74 episodes gave me a story I just wasn’t expecting and have yet to see something like it since.