It's been around 2 years since an apocalypse broke out, and even while trying to survive, Rui lost some of his friends... his closest friend Tsukasa included.

Yet he didn't want to accept that he lost him...

The inventor worked hard, trying to create a clone of his deceased friend, and after months of non stop working the clone was done. The robot acted and talked exactly like Tsukasa, if it wasn't for some slight appearence changes no one could tell he was a robot.

During Rui's break the scientist was trying to enforce his defense robot, fixing some loose screws and adding new features on his lab

"Tsukasa-kun, can you give me the screwdriver?"