Movie was on Funimation . Watched it 2010-2013 ? Girl lived with this boy . She was crafting something and went in a sliding crawlspace . She was not human but looked human , the boy had memories with her but she doesn’t remember she’s probably a robot . In the end she was stabbed and her body fell of a bridge and in a stream . The boy ran after to get her .
“Hal”(2013)
You can watch the full movie here, but there aren’t English subs: