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Kei Osanai enjoys a peaceful and happy life with his wife Kozue and daughter Ruri, but his wife and daughter die in an accident. Kei's life suddenly changes. One day, a man named Akihiko Misumi visits Kei and tells him that on the day Kozue and Ruri died, Ruri, who was a complete stranger to him, was coming to see him. Akihiko tells him about a woman named Ruri Masaki, who he once loved. These people, who don't seem related, connect under the name of love.