[clarification needed][1] Aya Domenig meets Chizuko Uchida (born 1923), a former nurse,[3] her grandmother and Shuntaro Hida (1917-2017),[4] a doctor,[1] the second Hibakusha (被爆者) who is portrayed in the documentary film – they have a similar fate as the filmmaker's grandfather who throughout his life never spoke about what he had experienced.

[5] While researching her film in Hiroshima, on March 11, 2011, the Fukushima Daiichi nuclear disaster occurs, and the film-maker's intention takes a turn.

[4] The German language title Als die Sonne vom Himmel fiel literally means When the sun fell from the heaven, and is referring to the atomic bombing of Hiroshima.

After assisting as nurse, Uchida returned to her parents' home, suffering from anemia, high fever and other aftereffects of the bombing.

"I was impressed by how she thinks on her own and moved on with her life after she experienced the bombing", Domenig said on occasion of an interview by the Japanese newspaper The Asahi Shimbun in October 2012.

[3] Aya Domenig also used archival footage showing the victims of Hiroshima and demonstrating the destructive power of the bomb on the human body.

[11] Als die Sonne vom Himmel fiel was produced by ican films gmbh and Schweizer Radio und Fernsehen (SRF) and Finnish Broadcasting Company (YLE).

[16] The Swiss newspaper Der Landbote claims: Aya Domenig succeeded the balancing act between personal retelling of the family history and the historical analysis.