As a result, the most direct definition of fillers is that they are original episodes generated for the anime series. What one person considers to be decent is often considered to be amazing by another, thus, claiming all fillers are terrible is a generalization, and this mentality is harmful in and of itself. While some people dislike and/or prefer to avoid fillers, they are not always terrible and labelling them as bad just because they do not adapt the source material is another too simplistic way of thinking, given that even the original sources for anime adaptations can have bad - and good - tales. It is a less simplistic and perhaps better way to define “filler episodes” to say that they are episodes used by anime - as well as other TV shows because fillers are not exclusive to the anime medium - usually between the individual plot points of the major arcs, or between the end of one major arc and the start of another.
Episode 142-147: Mizuki Tracking Mission.
