The novel has relatable characters and a likable main character, along with a harem theme, which I appreciate. However, my issue lies with the inadequacy of the power system. Initially, it was clearly established that all zombies possess a substance called gel that aids their evolution. The protagonist feeds this gel to his zombie girlfriend, who progresses accordingly. Then, a shift occurs, stating that advanced gels can only come from mutated zombies, which implies that the first gels were insufficient. Instead of logically gathering gels from regular zombies and enhancing one he controls, the protagonist starts actively searching for mutated ones in risky locations, despite having the means to create mutations.
This inconsistency becomes frustrating when the author later changes the rules, stating that only mutated zombies have the gels and that they evolved from consuming brains, contradicting the initial explanation. I double-checked the early chapters, but the description remains the same regarding the girlfriend's gel acquisition from regular zombies. It's baffling why the author didn't explore this method further.
Furthermore, the power system feels abstract and lacks clear progression, with underwhelming fight scenes. Given the focus on the "weak to strong" genre, this inconsistency and the unsatisfactory pacing make the novel fall short in this aspect. As for ecchi content, while it's not pornographic, I've seen spoilers suggesting that the first sexual encounter won't happen until around chapter 120-130, leaving the majority of the story focusing on the power progression, which has already been disappointing in the first hundred chapters.