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

In this single, Sheena canceled her partnership with Seiji Kameda, with whom she had arranged her songs up to that point, and asked musicians of various genres to arrange her songs. She arranged three songs in a "night, daytime, and a morning" order, according to the title, and she showed the reading of these song titles by writing katakana.

All players of each song were named "- Paradise Orchestra" on "Mayonaka wa Junketsu" which is the title tune of this single. Shin Tokyo Ska Paradise Orchestra (新東京スカパラダイスオーケストラ, New Tokyo Ska Paradise Orchestra) is a Ska band, and Higashi-Nihon Swing Paradise Orchestra (東日本スウィングパラダイスオーケストラ, East-Japan Swing Paradise Orchestra) is a big band, and Zen-Nihon Scherzo Paradise Orchestra (全日本スケルツォパラダイスオーケストラ, All-Japan Scherzo Paradise Orchestra) is the trio of a pianist, a bassist, a drummer, with accordionist coba.

Sheena intended to record "Mayonaka wa Junketsu" and "Aisaika no Choushoku" on the third album Kalk Samen Kuri no Hana. However, she judged that they weren’t suitable for the view of the world of the album while she was producing that, and she shelved the adoption of the two songs for the album.

The literal translation of song titles is slightly different from the official English title.

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