My Girlfriend Is a Serial Killer (2019)

Plot

After failing to gain university admission, Etsuro Kurosu retreats into a life of isolation. A failed suicide attempt leaves a hole in his wall, allowing him to glimpse his intriguing neighbor, Rio Miyaichi. His curiosity turns dark when he witnesses her committing a gruesome murder. Rather than flee, Etsuro confesses his feelings for Rio, and they embark on a twisted relationship. As he experiences newfound happiness, a looming question hangs over him: will he ultimately become her next victim, or can love survive amidst such danger?