Synopsis

Takuya Arima's historian father vanishes without a trace, leaving the student bewildered and searching for answers. Then, out of nowhere, a strange package arrives during summer break—a letter from his missing dad explaining that parallel worlds actually exist, along with a device that can travel between them. Takuya figures his father might be messing with him at first, but it turns out the thing really works. Now he's faced with a bigger mystery: is his father still alive somewhere? And if so, which world is he in?

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