High School of the Dead (H.O.T.D.) was introduced to me by a friend just this June. I only streamed the 12 episodes online but I haven’t watch the OVA yet. I also remember the series Walking Dead when I was watching H.O.T.D. because it doesn’t show how did the outbreak happen in the first season.
High school of the Dead is set in the present day beginning as the world is stuck by a deadly pandemic that turns humans into zombies, euphemistically referred to by the main characteres as “Them”. The story follows a group of high school students, the high school’s nurse, and a young girl as they fight their way to safety through the deadly streets of Japan during a worldwide catastrophic event known as the “Outbreak”. As the cast tries to survive the zombie apocalypse, they must also face the additional threats of societal collapse, in the form of dangerous fellow survivors, and the possible decay of their own moral.