Novel

Synopsis
Kaoru Tono heard a rumor: The laws of space and time mean nothing to the Urashima Tunnel. If you find it, walk through and you'll find your heart's desire on the other side...in exchange for years of your own life. One night, Kaoru just so happens to find himself standing in front of a tunnel that looks suspiciously like the one the rumor describes. He finds himself thinking of Karen, the sister he lost in an accident five years ago.

To Kaoru's surprise, he's been followed by the new transfer student Anzu Hanaki, who promises to help him experiment with the mysterious tunnel—but what does she want from Kaoru in exchange? And what will he have left to give, after the tunnel's done with him? (Source: Seven Seas Entertainment, edited)

About Novel
Hachi submitted the sci-fi mystery novel at the 13th Shogakukan Light Novel Award in 2018 and won both the Gagaga Award and Jury Special Award. Shogakukan published the light novel under the Gagaga Bunko imprint in a single volume in July 2019, featuring illustrations by Kukka (Gunjou Sanka).

Seven Seas Entertainment licensed both the light novel and manga adaptation in English this July and plans to publish the first volume of each on May 10 and July 26 next year, respectively.

Awards
Natsu e no Tunnel, Sayonara no Deguchi ranked among the top ten titles in the tankobon category in the Kono Light Novel ga Sugoi! 2020 rankings.