The Union of The Adolescent Beauties Z-Mind also subtitled The Battling Days of The Shimatachi Virgins) is a six-episode OVA series produced by Sunrise and Bandai Visual, released from February 25, 1999 to July 25, 1999.
The OVA series was initially released in North America on DVD in 2002 by Bandai Entertainment.
[1] At Otakon 2013, the OVAs, along with a bunch of other former Bandai Entertainment properties were rescued by Sentai Filmworks.
To combat them, the Japanese and American military forces have collaborated on a giant robot known as Z-Mind.
Z-Mind is piloted by three sisters: Ayame, Renge and Sumire.