Tatsuya Mine

After the murder of Luna, the robot society that rules the planet starts to rust and decay. Death and despair spread through the land like wildfire. The only one unaffected by the affliction that becomes known as "The Ruin" is Luna's assassin, Casshern. Unable to remember if he really triggered this capital sin against the entire mechanized civilization, Casshern embarks on a journey to unravel the mystery that connects him, Luna, and the plague.

After seeing the movie Psychokinesis Senpai, they discover that zombies have overrun the outside world! The protagonist heads for the river with a girl who calls him "senpai." Viewers will surely get a kick out of the unpredictable story development and the lines that touch on topics from love to cosmology.