Kekkaku Yobou

The contemporary context humankind has gotten involved in, COVID-19 and quarantine, has made us change our view of the world in general, especially when it comes to medicine and health issues. Current health advancements have helped humans not only to increase the life expectancy rates by finding proper treatments for diseases; those treatments have also evolved over time to become more affordable, which allows more people to be treated; more effective in terms of quality; less dangerous, as some obsolete treatments involved affecting negatively some parts of the body other than the one being treated, and more prompt, which is not necessarily related to quality but the time a treatment takes to show
positive results.

Whatever happened to the good old days: you know, dirty attics, tuberculosis and general all-round suffering? — Arnold Wesker

Just as Kiyohiko Azuma states in every chapter of his masterpiece manga, Yotsuba to!, "today is always the most enjoyable day," which involves understanding that, although not perfect in every possible way, today is better than the past, as we humans have come up with many kinds of advancements regarding technology.
This educational anime about tuberculosis shows how Japanese people from the 1930s, the mid-time between the Great War, Sino-Japanese War, and then World War II, treated this deadly disease and prevented its proliferation not so many years after its detection in 1882 by Robert Koch. If I could highlight an aspect—or rather a keyword—of this anime, it would be "time". Kekkaku Yobou is a time-travelling machine to the early 20th century's Japan and their struggles with a disease that had been taking the lives of more people than World War I did.
On the other hand, I would like to point out that you do not need to know about medicine—which is my case—or even know what tuberculosis is about; after all, this documentary-like anime manages to not only teach how to prevent tuberculosis but also what it means, its risks and what does it do to the human body. You would be amazed at how easy yet skillfully they explain the basis of this disease—tuberculosis 101. However, do not forget this is a 1933 anime, you will not see present-day treatments or the modern understanding of tuberculosis. So, regardless of whether you study medicine or you do not know what a disease is, this anime is going to catch your attention once you start it and pay attention to its easy-to-understand explanations.
This 30-minute anime manages to take you back into the past when going to the movies or hanging out with friends was considered a fateful, dangerous activity—or that is what I would say in 2019, just before Coronavirus made us remember those beautiful ol' times when you could fall victim to tuberculosis—the main character of Kekkaku Yobou.
In conclusion, you should watch this anime if you have some free time and you do not know what to watch, or perhaps you want to watch a rare anime.

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