Having come to Japan from America, the siblings desperately search for their long-lost father with limited funds and only a short time to stay. With no solid leads, their only hope lies in a Japanese friend they knew back in the U.S. Introduced to the smartphone apps "facebooki" and "boine (boin)," the kind-hearted brother and sister quickly become completely dependent on them. Whether these apps will actually help remains uncertain, but they refuse to give up. Will they finally find their father? And what is the true reason behind their arrival in Japan? The moment when the siblings' emotions converge and the truth is revealed draws near.