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Explanation of time travel
The Jewel of Four Souls.
The modern time is 'X', a period in the Sengoku period (戦国時代 - Sengoku Jidai - Warring states period) is 'Y', and 50 years before period Y is period 'Z'. At Z, Kikyo dies after sealing InuYasha to the tree, where he goes into suspended animation, and she is cremated on a pyre with the jewel, according to her wishes. At Y, the well (which exists in both ancient and modern times) drops Kagome, the 20th/21st century incarnation of Kikyo, off from the future. Here, everyone has gotten older but otherwise not much has happened. X is the 'modern' end of the well's wormhole through time.
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