On 15 May 2015, St. Michael Girls’ School launched a free short story series titled White Lily Memorial (白百合のメモリアル Shiro Yuri no Memoriaru). The translation by Ralen is hosted on this server as a mirror of the original pages.
The translation is hosted here at http://petalsgarden.axypb.net/trans/newgene/shortstory.html
The series will introduce the characters of A Kiss For The Petals – The New Generation! ahead of its release on 26 June. The first stories feature Aya and Ai. As of this post, the first of two currently available chapters has been translated.