Zombieland 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

Eikichi Hyodo is a 17 year old high school student who comes from a family that grows onions. He used to be part of the baseball team but had to quit because of an injury. As a result, he feels like his life is unfulfilled and lacks motivation. In contrast, his older twin sister Yuuko is in good health and has been given the chance to inherit their family business. Unfortunately, one day she vanished without any trace.