Sometime during the night of March 17 - morning of March 18 , three cars parked at an evacuation center in Yamadamachi , Iwate had their tanks filled up and two 20-liter containers of heating oil were left outside the center by an unknown person . An evacuee discovered the donation upon starting his car and noticing his fuel gauge go from nearly empty to full . The evacuee noted : " We had hardly any fuel left . We were in a real pinch . I 'm so grateful for the donation . I reckon it was Tiger Mask . " The evacuation center noted that they would use the heating oil during the night to conserve fuel due to the ongoing crisis . Other child welfare offices and agencies have reported increased , anonymous donations in the aftermath of the disaster
the ongoing crisis
2011 Tōhoku earthquake and tsunami
Tiger Mask donation phenomenon