The series is loosely based on the Moomin books by the Finnish author Tove Jansson[1] and was broadcast on Fuji Television from 1969 to 1970.

Jansson never approved of the series or its successor, due to their dramatic changes with the plots, overall atmosphere, and character personalities.

The anime series is notably different from the later anime television series Moomin, released in the early 1990s, which was translated into many languages, released in dozens of countries, and relies more on the original Moomin books and comic strips.

For example, Moomintroll was portrayed more as an ordinary boy; while still friendly like in the books, he is somewhat ill-tempered, occasionally fighting or behaving slyly.

This, along with elements such as Snork being a driver, common use of firearms, one scene in an early episode featuring characters getting drunk together at a bar, infuriated Jansson.

Osumi, who knows Moomin well, initially thought the content was too static to be suitable for animation, but accepted the position.

Takahashi, who respected Jansson's opinions and aimed for a plot that was faithful to the original work, was at odds with the advertising agency, which aimed for a plot that did not respect Jansson's original work on the grounds that "the style as it is will not be popular in Japan.

"[5] Osumi was invited by the advertising agency to a planning meeting, where he was surprised and frustrated by their inability to understand the spirit of the source material, due to comments such as "Let's run a bullet train in the Moomin Valley.

"[4] Osumi was dissatisfied and desired to quit, but was fascinated by the animation shown by Mr. Otsuka just before leaving company, and reconsidered.

[4] In making the animation, Osumi decided to base it on Moomin comic strips rather than the Jansson novels.

[4] In the casting process, Kyōko Kishida, who was regarded as a great actor with a strong acting background, was chosen to play Moomin.

This was due to the fact that she once contributed a story about reading a Moomin novel in an essay she had written for a newspaper.

[4] However, once the animation was actually broadcast, the response was more favorable than expected, and especially since the sponsor, Calpis, liked it very much, and the strong complaints receded, as if pushed by them.

When the broadcast began, Tokyo Movie and Zuiyo Enterprise asked Jansson to watch episode 7.

But, she gave the episode a low rating and submitted a letter to the staff with a series of complaints and requests.

For this reason, Tokyo Movie's upper management wanted to withdraw from the project and used Jansson's claims as an excuse to Zuiyo Enterprise, the sponsors, and the Fuji TV, who were willing to continue the program.

[5][6] With the departure of Tokyo Movie from the project, Osumi and other key staff and animators were also dropped from the production.

This evaluation led to a meeting with Jansson, and as a result, a few elements, such as character design, were returned to a status similar to Tokyo Movie, provided that it would be broadcast only in Japan.

As you can see from the actual work, it is based on the "no money, no car, no fight" philosophy of the original Moomin story.