Re-reading this after seeing the saintess's story (which seems to be from the first timeline before mc regressed to the now second-timeline), she's portrayed vastly different (she was way kinder there and just easy to manipulate), so this means either trash-rina started her manipulation way before (possibly from when mc and her were kids), or mc really was just a natural-born villainess and trash-rina saw an easy opportunity to exploit mc