when i returned to my solitary home, there was a woman i didn't know there――. her name is "sarina". she doesn't talk about herself, and no matter how much i ask, she insists on "not leaving". even though i'm confused, somehow i feel at peace when i'm with her. that 'strange cohabitation' began. beautiful, and somehow shadowy "sarina". little by little, we are attracted to each other, and eventually, we become one naturally. it was a life like a dream――but one day, suddenly, she disappeared. what remained was an empty room and memories that were too full. 'i' start running to regain those irreplaceable days. the true feelings that i only realized after losing them. what on earth was "sarina"?