Itoshii Uso: Yasashii Yami

One day Mio attends a middle school reunion and is reunited with her first love, Shuichi. Her love is rekindled when the guy approaches her, but they get caught up in an incident where members of the reunion start dying one after another.
(Source: News Yahoo)
~~ Adapted from the manga "Itoshii Uso: Yasashii Yami" (愛しい嘘～優しい闇～) by Aimoto Mizuho.