A high school sophomore in a secluded side of town and Karen's older brother.

Urashima Tunnel - Once you enter that tunnel, you can get whatever you want, but at a price. Kaoru Tohno, who seems to have an elusive personality and traumatic past, and Anzu Hanashiro, who is struggling to reconcile her ideal image and true-to-heart attitude, team up to investigate the Urashima Tunnel and get what they want. This is an unforgettable summer story of nostalgia and sprinting in a remote countryside.<br><br>(Source: HIDIVE)

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Kaoru Touno 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. On the 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 Hanashiro, 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?<br><br>(Source: Seven Seas Entertainment, edited)