Sergei, known most often by his code name D, works for Ajou and is charged with special missions. He is very cold and aggressive, skilled at operating the PPOR robots and follows various military tactics. He also possesses superhuman strength and endurance, as a result of artificial enhancement. He is sometimes seen taking in Gel as a way to retain his strength.    (source: Wikipedia)

Her classmates at school called her Key, as in the "key" to a strange mystery. Key's "grandfather" was a kindly old scientist wanting to use his skill in robotics to create peace and love in the world. But when that kindly old scientist passed away, poor Key was left behind, lacking even the ability to smile. 

There still is hope, however a message left behind for Key suggests a fantastic possibility. Could it really be possible for Key to become a real, live human, if she can only win the love of 30,000 people? A dark, haunting tale of cybernetic sci-fi dreams, spiritual visions, and the turbulent world of Japanese pop music. (Source: Discotek Media) 
 
Note: The two last episodes have a duration of ~98 minutes

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