Yeast (酵母 Kōbo?) is a unique crop produced within Wall Sheena.


The yeast produced in Wall Sheena bears resemblance to a lump of fermented soybeans the size of a human head. These batches of yeast are stored in sheds or tents along with other goods such as wheat, soybeans, and dry-cured meats in order to drastically slow the rate of decomposition.

The yeast stored with these various goods appears to transform said goods by currently scientifically unexplained means.[1]


  1. Attack on Titan manga: Chapter 23 (p. 46) — Current Publicly Available Information 11.


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