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>your waifu will die on the one year anniversary
Deal, Sasami is my waifu. But bringing her to life requires the royal trees to exist since her youthful appearance is thanks to those trees.
>you may not, do anything in general to extend your time together
Perfect, cause I won't do anything to extend it...I'll shorten it myself by mortally wounding her. Since she has a connection to the royal trees she will seek them out of self preservation. And since royal trees exist by extension goddess Tsunami exist because they are born from her. And by theory cannot exist without her.
In attempt to resuscitate her the Goddess Tsunami will assimilated with sasami giving her new life. (at this point your contract should be broken due to me shortening her life and outside forces extending it.) This new sasami will feature both the souls of sasami "revived" and Tsunami "goddess manifested in physical form" (even if your contract still is in effect you can only kill by theory sasami in which case tsunami will become the "new" sasami. And from assimilating with her she will in fact receive "old" sasami's memories. Making her essentially Sasami "redux")