I'm assuming you're referring to the Japanese manga and anime series "Natsu e no Tunnel, Sayonara no Deguchi" (also known as "Tunnel to Summer, Exit of Goodbye").
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"Natsu e no Tunnel, Sayonara no Deguchi" is a Japanese manga series written and illustrated by Tomo Fujimura. The story takes place in a coastal town and revolves around three childhood friends: Kai, Akane, and Akira. As they navigate their relationships and adolescence, they stumble upon a mysterious tunnel that leads to a seemingly idyllic summer. I'm assuming you're referring to the Japanese manga
The series has received positive reviews for its thoughtful exploration of adolescent emotions, relationships, and the complexities of growing up. Fans praise the series for its relatable characters, poignant storytelling, and beautiful artwork. As they navigate their relationships and adolescence, they