Zombie Land Saga Gaiden: The First Zombie

Zombie Land Saga Gaiden: 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 Fasuto Zonbii) is the spin-off manga that began its publication on May 19, 2021 in Ultra Jump magazine.

Plot
Eikichi Hyodo is a second-year high school student, and the eldest son of an onion-growing family. Eikichi withdrew from the Baseball Club due to injury, so he now considers his life to be mediocre and has no encouragement. On the other hand, his twin older sister, Yuko, is in perfect condition and has the opportunity to take over the family business. However, one day Yuko disappears without a trace...

Humans

 * Saga Sagako Busters
 * Eikichi Hyodo
 * Yuko Hyodo
 * Anna Shuri
 * Tae Yamada
 * Hanako Hakase
 * Xu Fu
 * Death Metal fans

Demons

 * Matsunokami
 * Onsen Demon
 * Demon of separation

Trivia

 * The manga takes place in the year 1989 of the Christian era, 29 years before the events of the main series.
 * It seems that a Christian apocalyptic prophecy will be relevant during this manga, but considering that there were demons that tormented Saga and could break free from his seal at some point.
 * 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 demon 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 again.
 * In the anime the curse is present by killing the girls through accidents and Xu Fu is the one who is in charge of giving the position to someone to fight against the curse for each era.
 * The room that serves as the Saga Sagako Busters' hideout is the same dungeon that Franchouchou holds its meetings 30 years later.
 * Franchouchou is destined to face the curse in the EEF so it could make the curse unleash demons again to prevent this from happening again as part of a counter-offensive.

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