Tazuna, a high school student who is good at tinkering with machines, receives a repair request and visits a university laboratory. There, he met a girl, Koyori , who was sleeping in his bed. Tazuna touched Koyori's fingertip as if he was being guided by something. Then, a voice pours down from somewhere, and a different world "Ziggurat" appears in front of him. That was the beginning of the battle for the "wish" of the two who woke up as "Handshakers".