On March 11, 2011, Okawa Elementary School in Ishinomaki City was engulfed by a tsunami, and 74 children, or 70% of the school's children, were killed. 51 minutes elapsed between the earthquake and when the tsunami reached the school. The school was informed of the tsunami and a school bus was on standby, but students did not evacuate. Okawa Elementary was the only school that suffered a large number of casualties in this earthquake. This documentary follows the lawsuit that followed the disaster, where the parents sought the truth behind the tragedy.