Moyashimon, Jinrui wa Suitai Shimashita Recommendations
The main characters in both shows are witty and sarcastic and have unique communications with tiny, cute creatures. A similar dark humor is frequently used in the two series that appeals to a more mature audience. Both shows also have clear morals about society.
A same general feel occurs between the two. The main character of each shares a style of narrating with wit and sarcasm. The most prevalent relation of all, however, has to be the small creatures that are in both. The fairies and microbes are for the most part happy little creatures.
Both are quirky shows that deal with small beings and their interaction with humans. In Moyashimon, microbes are perceived way bigger than their real-life size, making them about the size of fairies. Both have a really unique kind of humour.