One of the key elements that makes regression stories so compelling is the way they subvert traditional notions of character development. By regressing to a younger state, characters are often forced to relearn skills, re-experience emotions, and re-confront their past traumas. This process of regression and self-discovery allows creators to craft complex, nuanced characters that are both relatable and fascinating.

According to character data from SeaArt AI , the series is noted for its distinct character designs:

Given these elements, it seems you're looking for doujinshi that combines elements of regression (possibly time travel or regression to a previous state), soldiers, and focuses on female characters, possibly in a competitive or conquering context.