Synopsis

Takuya Arima's father—a historian who'd been looking into some pretty mysterious stuff—suddenly vanishes. Then, out of nowhere, Takuya gets a weird package from him during summer break. Inside is a letter explaining that parallel worlds are real, along with a device that can supposedly let him travel between them. At first Takuya thinks it's all nonsense, but he soon discovers the device actually works. Now he's got bigger questions: Is his dad still alive somewhere? And if so, where the hell is he?

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