Do not investigate it yourself!!!Police said the body parts are of eight women and a man and include two severed heads, in the apartment in Zama, a city just outside the Japanese capital of Tokyo.
They had been investigating the disappearance of a 23-year-old woman who went missing earlier this month and had been seen with the man near the apartment.
Police think the woman may have met the man - Takahiro Shiraishi - on a website for people with suicidal feelings.
Shiraishi, 27, told investigators he had killed the nine people and attempted to hide their bodies.
According to public broadcaster NHK, he told police: "I killed them and did some work on the bodies in order to hide the evidence."
The two heads were reportedly found inside a cool box at the entrance to the apartment and the other body parts were found further inside.
A saw was found in the man's room, according to reports.
A man who lives on the same floor told the Japan Times that he had noticed an "odd smell" when he walked past the apartment in August, describing it as "like sewage".
I soon cam home to a driveway with cop cars and a big pile of plants!