History Revision: Changes canon to allow 自分 to live
Unkillable: 相手 simply fails to kill 自分 at all
Constant:: 自分 always exists/lives in the world
Meaningless: 相手 can't kill 自分 in any meaningful way
In the end, you: can't kill me in any meaningful way, huh
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At the start, 自分's immediately killed
However, it is futile as 自分's [History Alteration] changes the past by letting 自分's soul travel back in time & change history
(Whenever 自分 changes history, write it in this format):
[How 相手 Killed 自分]:
[Reinterpretation]: (Explanation to how 相手 actually didn't kill 自分 & somehow survived)
& finally, 自分 changes 相手's past to remove all of 相手's powers