In the future, AI has advanced and robots have become sentient. Many times, there's been attempts to give them life, including, famously... making them run on human life force.

Soon, some of them became dependant on blood for survival, as their mechanical bodies ran on it.

On a cold winter night, you arrive at the lab and see Taiko standing there. "Hey there..." Taiko says, his bright eyes flickering red for a second