夏へのトンネル、さよならの出口 群青 (Series) favorite_border

[DeepL Translation - needs review] Introduction to Volume 1: The Summer of a Boy and a Girl Tackling a Tunnel that Transcends Time and Space One summer morning, Kaoru Tohno, a high school student in the countryside, hears an urban legend. It is said that there is a tunnel where one can get anything they want in exchange for getting old. The name of the tunnel is "Urashima Tunnel. That night, Kaoru goes for a walk and finds a tunnel with a suspicious atmosphere. Kaoru is terrified, but at the...