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Tv show or movie or miniseries possibly anime/manga, I can't remember.
A fairly major plot point was the guy was losing time, relieving the sameish day over and over again, and he started cutting himself, so there was a permanent mark he could be sure about his suspicion.
last time I asked had to go without internet for an extended period of time so could not respond.
It wasn't groundhogs day like, The people/person that was hosting him did something so they forgot the prior day, after a while the main character suspected something was happening, so he made a smallish cut on himself, this went on for a number of days, till he came to the realization that something was up.
