At the age of 14, the beautiful and lovely girl Rio Ozawa (played by Nozomi Sasaki) experienced an unprecedented change in her life. After that, she fell into depravity and relied on compensated dating and fraud with her familiar friends to accumulate money. Under the bright and beautiful appearance, she could not hide the inexplicable despair and emptiness in her heart. An accident made Rio meet Ozawa Mitsuteru (played by Shosuke Tanihara), a university teacher with the same surname as her. Mitsuteru's handsome, upright, slightly dull and dull appearance and temperament instantly captured Rio's heart. Her soul shrouded in clouds seemed to be dispelled by the brilliant light from the heart of Mitsuteru, and she gradually fell in love with this big boy. However, Mitsuteru could not devote himself to the relationship wholeheartedly, because several years ago, he had been diagnosed with a malignant tumor, and there was little time left in the world... This film is adapted from the mobile phone network novel of the same name.