The OVA episode, referred to as episode 10.5, depicts events occurring somewhere within the timespan of episode eleven of the series. The series is based around the efforts of humanity to quarantine and eradicate the diclonius, a species of mutant humans with horns. It focuses on "Lucy", who escapes her holding facility and is believed to be the first diclonius, and on two teenagers, Kohta and Yuka, whom Lucy encounters in the Japanese city of Kamakura.
The OVA episode, designated as episode 10.5, portrays events occurring within the timeframe of episode eleven in the series. The series centers on humanity's efforts to quarantine and eliminate the diclonius, a species of mutant humans with horns. It focuses on "Lucy", who escapes her confinement facility and is believed to be the first diclonius, and on two teenagers, Kohta and Yuka, whom Lucy encounters in Kamakura, Japan.