Aidan Connor is a globetrotting American photojournalist. Burned out from a disastrous assignment, he turns up on the Tokyo doorstep of his old college friend, Mima. He soon learns that Mima's past (and his own) have become present. A talented artist, Mima is struggling to make it on her own. Two of her oldest friends, Sora and Eko are also battling a peculiar form of social injustice: they are branded "Parasite Singles" because both still live at home despite being in their early thirties. Aidan knows everyone has a story: a brilliant painter, Sora suffers from mental illness. Eko, who appears to be the poster child for the term also has a dark past. As he remakes himself, Aidan is reminded of what kept him close to Mima all these years. He also sees what keeps Mima, Sora, Eko and Mima's old love so close as well...one thing never dies.