Takemichi Hanagaki is a twenty-six-year-old who experiences trauma from the death of Hinata Tachibana, who, besides being a great friend of his, was also his first true love. He does not engage in any other romantic relationships, ending up living in a very rundown building and doing a job he hates. After being pushed in front of a speeding train, he discovers that instead of dying, he has experienced an incredible journey back in time, capable of taking him to before Hinata's death. Takemichi's purpose becomes to protect Hinata, even though he knows this will be particularly difficult: the girl was killed in retaliation by some young criminals, and the only way to prevent it is to become more "powerful" than them.
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