This is a city where personality traits, psychology and interest are quantified in order to assign a ‘perfect match’ for qualified members of the society. Boundaries are drawn by a state of 'perfection' maintained by the pairing system, while those wishing to find their partners at their own will are to be expelled. Growing up in the outer circle, Shun has always been longing for finding 'the one' through the pairing system. Emma, on the other hand, keeps a secret from her loving partner assigned by the system. When their paths cross, they are walking without a direction.