Zombie Land Saga Gaiden: The First Zombie

Zombie Land Saga Side Story: The First Zombie (ゾンビランドサガ外伝 ザ・ファースト・ゾンビィ Zonbirando Saga Gaiden za Fāsuto Zonbyi) is a spin-off manga that works as a prequel to the main anime. It began its publication on May 19, 2021, in Ultra Jump magazine and ended on November 17, 2022.

Summary
Eikichi Hyodo is a second-year-high school student, and the eldest son of a family that farms onions. Eikichi withdrew from the baseball club due to an injury, so he now considers his life mediocre and has no encouragement.

On the other hand, his mother and his twin sister, Yuko, are in perfect condition and have the opportunity to take over the family business.

However, one day, the older sister disappears without a trace…

Humans

 * Saga Sagako Busters
 * Jofuku (Head of Operations)
 * Tae Yamada (Group Leader)
 * Eikichi Hyodo
 * Yuko Hyodo
 * Anna Shuri
 * Hanako Hakase
 * Lily Hoshikawa's parents
 * Takeo Go
 * Sachika
 * Keiji Higashino
 * Skull and Bull
 * Araki Aiba
 * Saki Nikaido
 * Junko Konno (mentioned)
 * Tae Yamada's parents

Sagako Monsters

 * Pine Sagako
 * Hot Springs Sagako
 * Love Sagako
 * Cassete Sagako
 * Squid Sagako
 * Human Mannequin Sagako
 * Spider Egg Sagako
 * Goby Eel Sagako
 * Mudskipper Sagako
 * Giant Spider Sagako

Others

 * Magatsuhi
 * Romero

Trivia

 * Although, the title of the spin-off manga suggests that Tae was the first zombie to be successfully resurrected, this is technically not the case, as Romero is shown to be a zombie way back in the 1800s when he was living with the Momozaki Family.
 * Though, in terms of zombified humans, Tae would correctly be the first to be resurrected but the last to “wake up”. Whereas Romero is the first and only (conscious) zombified animal, so far.
 * The manga takes place in the year 1989 of the Christian era, twenty-nine years before the events of the main series.
 * Saga's curse is based on the legend of Xu Fu, who sent Saga to seek the Elixir of Immortality 2,200 years ago, the magician Anqi Sheng offered him the elixir upon his arrival. However, Chinese legends speak that Xu Fu met a huge sea beast that could be a Sagako and that after his arrival in Saga, Anqi Sheng threatened the emperor of death by launching a meteorite on the Yellow River in China and saying “The first emperor will die, and their lands will be divided.” Soon after, the emperor died of mercury poisoning and China was divided yet again.
 * In the anime, the curse is present by killing the girls through what seems to be accidents with Jofuku being the one responsible for giving the position to someone to fight against the curse for each era.
 * The room, and by extension, the mansion, that serves as the Saga Sagako Busters' hideout is the same dungeon that Franchouchou holds its meetings thirty years later.
 * The last chapter, Chapter 17: See You Again SAGA, is the only chapter in the spin-off manga to copy the same naming conventions as the episode titles in the anime as well as Kotaro Tatsumi's theme, "Never Ending SAGA".
 * Tae's death is the only one revealed through this spin-off manga, wherein she met her demise when fused with a baby Sagako.

Official Art
es:Zombie Land Saga Gaiden: El Primer Zombie fr:Zombie Land Saga Gaiden : Le Premier Zombie