Anzu discovers his secret, and the two form a pact to investigate the tunnel together. They run experiments to calculate the exact time dilation ratio: three seconds inside equals roughly two hours outside. As they spend summer days planning their ultimate deep dive, they grow incredibly close, finding solace in each other's shared loneliness.

Since its release, Natsu e no Tunnel, Sayonara no Deguchi has garnered a dedicated fanbase, with audiences awarding it a . The most common praise is for its stunning visuals, powerful musical score, and the incredible chemistry between the two leads, with many reviews describing it as "a heartfelt, emotional, and visually beautiful film that explores grief, love, and the passage of time in a deeply meaningful way". The chemistry between Kaoru and Anzu has also been noted as "outstanding," adding a layer of authenticity to their blossoming relationship.

The film won the prestigious Paul Grimault Award at the Annecy International Animation Film Festival. Critics frequently praised the sharp pacing, the realistic character writing, and the hauntingly beautiful musical score composed by Harumi Fuuki, alongside the theme songs performed by eill. Official Streaming and Viewing Guide

Memory as Archive and Burden: Memories must be curated. Some become archives to revisit; others are burdens to set down. The tension between preservation and release is a moral task in the narrative: what should be carried forward?

Driven by the overwhelming desire to see his sister again, Kaoru decides to find the tunnel. His search leads him to a strange, surreal passageway that warps the laws of space and time. As he investigates the tunnel's secrets, he is discovered by a new transfer student, . Anzu is an aspiring manga artist who feels rejected by her family and suffers from imposter syndrome, believing her art is mediocre at best. She is intrigued by the mystery and the potential to use the tunnel to achieve her own dreams, so the two form an unlikely partnership to study the phenomenon together.

A reclusive high school student plagued by intense guilt over the accidental death of his younger sister, Karen. His home life is broken due to an abusive, alcoholic father.

As of 2024, the film is available for streaming on HIDIVE and Hulu in North America. You can also rent or purchase it digitally on platforms like Amazon Video .

If you are looking for the musical pieces from the film " The Tunnel to Summer, the Exit of Goodbyes

Links to “full” versions of the film on video-sharing sites like Bilibili or illegal streaming websites are often unauthorized uploads. These sources frequently have poor video quality (e.g., 480p, not HD), incorrect or missing subtitles, and may be taken down for copyright infringement. They could also expose your device to malware. It is always recommended to support the creators by using legal platforms.

The film has received mixed to positive reviews from audiences.