It is the thirteenth anniversary of the day the Heterodyne first appeared- the day Ibuki's father died. Ibuki has always based her strength and purpose on the belief that her father was a hero who tried to warn everyone that the Heterodyne were coming, but are her memories real, or just wishful thinking? Domeki suspects the latter, and her revelation that the truth about Ibuki's father is far less glorious may be more than the young Dai-Guard pilot can take.