Moyashimon is a story about agricultural university in Tokyo and its students. The story starts with Tadayasu Sawaki, freshman who has just enrolled and has gift to see the microbes. The story develops around him and a lab of professor Itsuki, where other students gather and do experiments. 159 chapters cover just one year, which is very eventful and full of various situations. Basically, it shows daily life of students and their struggles, with high note on comedy. The author manages to keep the manga very interesting all the chapters long, though some of them don't keep high standards, but are still decent, which isa big plus. The story is special because it blends slice-of-life comedy with biology/chemistry lectures on various topics such as fermentation, all sorts of alcoholic drinks (also their history, preparation), bacteria etc. While having fun with characters getting into awkward situations, you can also learn lots of interesting facts.
Even though some of the most noticeable traits of main characters can look generic like Aoi's desire to get drunk all the time or Tadayasu's passiveness to let others to drag him around, the characters develop with time and chemistry works very well. They get into misunderstandings, fights, feuds, but they learn more about each other and change their behaviour. Good thing is that even though Tadayasu was presented as the protagonist with great ability, it doesn't give him much advantage at all (it doesn't affect the plot much as well) and the focus wasn't on him large part of the time, so all other characters got their time to shine and a chance that we get to known them better. Characters have an extreme trait (ability to see the microbes, greediness, being a clean-freak, being a drunk) and they are often put into unpleasant situation because they make a reaction which causes others to react as well and situation gets more complicated and silly, or each one of them is trying to take advantage of others and it gets interesting when they become rivals, but that doesn't get overused because the author was creative with jokes and they feel new and refreshing.
The manga really stands out from others with such approach to blend the story and lectures, supported by very good characters and various situations which refer to certain chemical processes or bacteria. It deserves praise and high place.

In the end, I would like to refer to Kei Yuuki that newcomers don't get misinformed from some websites, so here will be minor spoilers. I've seen at some places that certain people push Kei Yuuki as "trans" and refer to him as a "she". Kei is Tadayasu's childhood friend and even though they have very close relations, anything alluring to love was used as a gag which led to a comedy of situation (Kei would do X thing, Tadayasu would be shocked, third person would be shocked as well and get wrong impression, Tadayasu would feel embarrassed and make the situation worse by trying to explain what actually happened). Everyone has a characteristic trait, just like Aoi adores alcohol, Kaoru uses every chance to use the situation to make profit or Haruka always wearing leather, Kei is crossdressing and cares about his childhood friend. The author plays with the bound between Kei and Tadayasu, but romantic outcome never happens, because that's the joke. Sawaki even told him in chapter 155 that they will always be inseparable friends, not alluring to anything more or less. Nevertheless, Kei has always identified as male and all the character details in margins state that he's a guy - "he's without a doubt a man among men", "I think all of you are aware of this, but he's a guy. Just in case.", "Even if he wears gothic lolita fashion, he identifies as a man. He's the best fried of Sawaki, the main character." If that's not enough, chapter 118 and 133-134 cover that subject well. I wrote this because I dislike seeing Kei's image tainted with misinformation to satisfy someone's fetish.