In the apartment, there was a saw apparently used to cut up the bodies as well as eight cooler and storage boxes. Police found she had exchanged messages with Shiraishi on a website on suicide, alongside security footage of her with Shiraishi walking around two train stations, one of which was near the apartment.
Police said Shiraishi confessed to killing the woman and putting her body in a refrigerator.
A bloodcurdling discovery was made in the apartment in Zama, a city in Kanagawa Prefecture, during an investigation into the disappearance of a young woman who went missing earlier in October.
"It was meant to hide the body that I killed and to hide evidence", he told the police.
The Tokyo police on Tuesday arrested a man after nine dismembered bodies, including two headless, with their flesh stripped off, were found his apartment in suburban Tokyo.
A Japanese man has now been arrested and is being held by police on charges of discarding a dead body. Questioned by AFP, a spokesman of the police could not confirm this information in the immediate future.
A man was arrested Tuesday after the severed parts of nine bodies were found stored in coolers inside his apartment, Japanese media reported.More news: Danish submarine owner admits dismembering body of Swedish journalist
The apartment is located near the U.S. Army's Camp Zama.
An investigation was launched after the woman's older brother reported her missing to the Takao Police Station in western Tokyo on October 24, saying he had not been able to contact her since October 21.
A surveillance camera captured Monday, images of the man accompanied the girl, said NHK, citing police.
A man who lives on the same floor as the suspect said he noticed an "odd smell" when he walked past the apartment in August.
Although Japan has one of the lowest crime rates in the world, it has seen some high-profile killings recently.
"I thought it smelled like sewage", one neighbor said. Just this month, a man allegedly killed his wife and five children after setting their home on fire.