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@InsaneInsomniac The Isekai genre doesn't necessarily imply a world entirely separate from the world a character or several characters originated from. An isekai is when the story employs travel from one world to another world, typically with the second world loaded with fantasy stuff, unlike the first world. From what foggy parts I can remember about what happens in Inuyasha, Kagome ends up time traveling to the past, but even though the past is a year far before the year Kagome is from, Inuyasha's timeline runs parallel to Kagome's own timeline. Considering the many-worlds interpretation, Inuyasha's own timeline is a world separate from Kagome, because it runs its course parallel to Kagome's world, despite both worlds originating from a common point in time, and the year of each world being vastly different. When Kagome enters Inuyasha's world she enters a timeline that flows constant to her own. Moreso, the entry point (the well) that Kagome uses to enter Inuyasha's world doesn't lead her back to the point of exit as her first time did - it's always back to an ever-flowing timeline.
Think of it like a river that forms a delta, whereas the river eventually splits its flow into Flow A and Flow B. Each river flow has its own fish, and each river flow never has its inhabitants experience whatever happens in the other flow. We'll use "world" liberally here and just say that each Flow is the world to its own inhabitants. Flow A has fish with reptilian characteristics. Flow B has normal fish. In the future, Flow B's fish have already reached the ocean, but some of the fish are able to travel backwards in time due to a hidden river current that defies present-day logic. However, even though the time-traveling fish can travel back to an earlier date of their own river, the river flow they arrive at is actually Flow A, which runs parallel to Flow B. Even though both flows originated from the same river (the same world), each flow is clearly not the same world the fish from Flow B have experienced, because if not for the hidden river current, they would have never experienced Flow A and its reptilian fish inhabitants. Analogies aside, Flow A and Flow B are their own universes - their own worlds - even though both originated from the same universe, or the same river. In modern-day logic one can never experience travel between two universes. This is why Inuyasha can be characterized as an isekai.
As for the Noh Mask event, the mask demon never had its shikon jewel collected in the past, only in the present during its rampage. However, the story completely ignores that the jewel in the past had not been collected, and is a plot hole left unfilled. I might be missing out, but I'm unsure what you mean by how the past affected the Noh Mask to appear in the present. Do you mean how the Noh Mask was never dealt with in the past, but was dealt with in the present?
Think of it like a river that forms a delta, whereas the river eventually splits its flow into Flow A and Flow B. Each river flow has its own fish, and each river flow never has its inhabitants experience whatever happens in the other flow. We'll use "world" liberally here and just say that each Flow is the world to its own inhabitants. Flow A has fish with reptilian characteristics. Flow B has normal fish. In the future, Flow B's fish have already reached the ocean, but some of the fish are able to travel backwards in time due to a hidden river current that defies present-day logic. However, even though the time-traveling fish can travel back to an earlier date of their own river, the river flow they arrive at is actually Flow A, which runs parallel to Flow B. Even though both flows originated from the same river (the same world), each flow is clearly not the same world the fish from Flow B have experienced, because if not for the hidden river current, they would have never experienced Flow A and its reptilian fish inhabitants. Analogies aside, Flow A and Flow B are their own universes - their own worlds - even though both originated from the same universe, or the same river. In modern-day logic one can never experience travel between two universes. This is why Inuyasha can be characterized as an isekai.
As for the Noh Mask event, the mask demon never had its shikon jewel collected in the past, only in the present during its rampage. However, the story completely ignores that the jewel in the past had not been collected, and is a plot hole left unfilled. I might be missing out, but I'm unsure what you mean by how the past affected the Noh Mask to appear in the present. Do you mean how the Noh Mask was never dealt with in the past, but was dealt with in the present?
