"Mayonaka wa Junketsu" (真夜中は純潔, Chastity at Midnight) is Japanese singer Ringo Sheena's 6th single and it was released on March 27, 2001 by Toshiba EMI / Virgin Music.

All players of each song were named "- Paradise Orchestra" on "Mayonaka wa Junketsu" which is the title tune of this single.

Sheena intended to record "Mayonaka wa Junketsu" and "Aisaika no Chōshoku" on the third album Kalk Samen Kuri no Hana.

[1] The song was covered by Mino Kabasawa on her piano cover album Piano Pure: Memory of 2001, by Rieko Miura, Atsuko Kurusu and Saki Kamiryo on the NTV variety show The Yoru mo Hippare: Aki no Special on September 22, 2001 and by Max on the NTV variety show The Seiya mo Hippare: 2001 Christmas Special on December 15, 2001.

The story was that a mysterious woman fights with a baldheaded leader of an evil secret society.