Golden Time Anime: How did Banri lose his memories?

Golden Time Anime has spent quite some time into the passage of time. Yet today we dare not from asking, how did Tada Banri lose his memories? Is his amnesia realistic?

Golden Time Ending, Explained

Golden Time Ending, Explained

Golden Time (2013) Review: A Refreshingly Real Tug at the

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Golden Time Review

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A World That Does Not Exist. — Golden Time - 24 [End]

Golden Time Has Great Romance, Comedy And Drama -- And A Terrible

Golden Time Review