Shounin Kyoumei no Souvenir (STEINS;GATE 承認共鳴のスーヴェニア Shounin Kyoumei no Suuvuenia) is a short story written by scenario supervisor Naotaka Hayashi. The story centers around Moeka Kiryu and Mayuri Shiina. Movie-goers would recieve this story between May 18 and May 23, 2013.
It's preview text reads:
それは、悔やまれる 萌郁のデジャヴ なぜ私は、椎名さんの厚意を
無下にしてしまうのだろう」
Sore wa, kuiyamareru Moeka no dejyavu "naze watashi wa, Shiina-san no koi wo
mugeni shiteshimau no darou"That is, Moeka's déjà vu filled with regret. "Why did I, completely refuse/reject/disregard Shiina-san's kindness?"