A year and a half ago, brain surgeon Masaru Kawauchi (Hana Sugisaki), who suffered brain damage in an accident, suffered from memory impairment and lost all the memories of the past two years. The new memories are only for one day.Memories of one day will fade away.Get up at 5 o'clock every morning, read the diary on the table, and re-remember the lost memories. The day starts like this.

Currently, Masaru Kawauchi is receiving treatment from Koichi Osako (Shin Iura), a professor of neurosurgery at Kanto Medical University, and is working at the training hospital where he lost his memory. However, he does not perform any medical treatment and only works as an assistant.

One day, the brain surgeon Yuji Sanhei (Ryuya Wakaba) who returned from the United States came to report that when Masaru Kawauchi took him to visit the hospital, an emergency patient was brought.The patient is actress Rena Sekirei, and the test result is cerebral infarction.After getting the consent of her husband and agent Emoto Hiroshi, Sanpin decided to carry out treatment immediately. Sanpin instructed Masaya Kawauchi to help, but was stopped by the head nurse Tsubata Reiko (Michiko Yoshise).After the operation, Sanpin learned from the emergency minister Kota Hoshimae (Yudai Chiba) that Masaru Kawauchi suffered from memory impairment.

Although Lena woke up after receiving treatment, she could barely speak and was diagnosed with residual aphasia.The actress' career could no longer continue, and Lian Na could not do anything and began to give up on herself.

Sanpin told Masaru Kawauchi that there were not enough manpower, so just do what you can, and directly talked to the dean Toshiyuki Todo (Junpei Yasui) to let Miyami also serve as a doctor for examination and diagnosis...