Tunnel to the summer, goodbye exit Gunsei (volume 1-4 volumes)

Publisher: Shogakukan
Author: Eightse Say, Kukka, Small Udon
Size: 128mm x 182mm
Number of books: 4
Language: Japanese
Category: Youth manga, manga
Latest release date: 2021-12-17

Synopsis:
Summer of boys and girls who challenge tunnels that transcend space -time
On the morning of summer days, Kaor Toto, a high school student in the countryside, hears an urban legend.
When you get inside, there is a tunnel where you can get anything you want instead of getting older.
The name is "Urashima Tunnel".
Kaoru who went for a walk that night and found a suspicious atmosphere tunnel.
Kaoru was afraid, but at the same time he was interested.
"If this tunnel was a real Urashima tunnel ..."