Episode 1
S1E1
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When Sakuragi Haruko's father's factory is bombed, Oba Hiroto stops Haruko when she tries to rescue her father from the fire. They meet again a few years later when Haruko is working as a nurse and Hiroto is brought in as a patient with a heart condition. The second couple is a Korean man, Boku Hitoshi, and another nurse, Yamada Kazue