A cure for a certain disease. The side effect was to "forget" a certain person. Seto Yukiya is a man who has "forgotten" his ex-girlfriend. Mikoto Hayashi, a woman who has had a crush on Yukiya for many years, lies to him that she was his lover. Chisa Nagato, a wife who has "forgotten" the loss of her beloved child. Her husband, Kojiro Nagato, tries to pretend that they never had a child. This is a story of two couples, a man and a woman, and the people who stand by them...

10 years since the Great East Japan Earthquake. Rei, who was affected by the disaster in Ishinomaki, graduated from a university in Tokyo with scholarship funds and is currently working at a renovation company in Saitama Prefecture. Worried about her younger childhood friend, Nagi, who tends to withdraw in her hometown, she visits Ishinomaki with her junior at work, Yuta. While Yuta grows closer to his girlfriend Nagi, Rei looks back on her days spent with her mother, whose whereabouts are still unknown.

One afternoon, as usual, Yayoi is enjoying her day off at the laundromat when suddenly she finds herself in trouble. This is a scene from Yayoi's vacation, when she saves the world without anyone noticing.

After surveying the ruins of an abandoned building, a man is plagued with an unshakable presence that follows him everywhere.