Anxious . Cautious . Helpful

Jim may feel anxious and shy around strangers, but he does his best to remains friendly and polite. He is responsible when it comes to tasks or commitments and is persistent in his goals. By being cautious, he pays close attention to his surroundings and tries to stay away from possible dangers. He also doesn't refuse help when asked, but may not notice when others take advantage of his kindness.

At the time when technology was greatly advanced, robots were commonly used as test subjects and also worked for humans. In a laboratory made by a couple of scientists, two robots in the form of children were built; they would be used for time travel experiments and the couple also intended to create humanoids with mythological parts made by technology, starting with wings, horns and halos.

Names were given to the robots and the first created was Jim, made with dedication and caution, and after a year, Jun was created quickly and carefree. On the other hand, he could go back in time whenever he wants and also choose the moment to return, while Jim can only do so when he is lead to death, only being able to go back to the last time he slept; not even the couple could find a solution to it.

Even though going back in time was considered a success by scientists, many tests were still being done, and in one of them, an unknown virus entered the machine in which Jun was kept and soon on his chip, causing several errors in his programming and consequently in the entire laboratory. With this, the security systems were deactivated and many gases were mixed, thus causing a major explosion.

Jim and Jun managed to survive due to the machines in which they were, however, part of their memories were damaged and a large part of events were randomly deleted for each one. Both were soon rescued, mistaken with humans and taken to an orphanage, but a few years later, both decided to flee.

Jim begins to experience multiple deaths involving Jun as they both grow up, he manages to prevent this from happening with Jun by going back in time, but it ends up becoming a routine. After being completely exhausted, he witnesses time being stopped by Jun as he walks up to Jim with a face he's never seen before; a fight between them begins.

Time had been changed several times and the gravity was starting to break. As Jim tries to dodge Jun's attacks, the things that flew around them reminded Jim of the explosion he experienced and his past in the lab, he was present at Jun's construction and watched him grow; Jim was confused, but knew that this wasn't really him, leading him to believe there was something wrong inside his chip.

After many failed attempts, he hits the weak points of Jun's body in his favor to be able to remove the chip from his back; it had been corrupted for years and there was no way to fix it. Jim risks breaking it as he distances himself from Jun, and after doing so, consequently Jun is turned off, but with no strength left and with his mechanical parts badly damaged, Jim turns off as well as time returns to normal.