Sumire Nitta never had lofty ambitions. In fact, much of her daily routine is the picture of normalcy. She takes the train each morning with her childhood friend-turned-boyfriend, Takumi Ezaki, diligently completes her work, and always returns home before dark—no worse for wear. If anything, her sole ambition is to live a quiet, peaceful life with her sweetheart. However, there's one person standing in her way: Sasaki. There's a sinister glint in his eye whenever he looks at her, almost like he's planning something... something that will soon turn Sumire's entire world upside