The Tunnel to Summer, the Exit of Goodbyes

The Urashima Tunnel distorts time in a specific way: one hour spent inside the tunnel equals one week in the real world. This allowed Kaoru and Anzu to explore the tunnel repeatedly while only brief time passed outside, but it also meant they had to be extremely careful about their timing inside.

The tunnel's time-bending nature is hinted at when Kaoru first enters alone and discovers the dramatic time difference.

Kaoru's sister Karen has passed away, though the exact circumstances are not detailed in the summary. Her death haunts Kaoru throughout the film, and his father wrongly blames Kaoru for the family's tragedy, holding him accountable for the loss.

Kaoru's father's unjust blame foreshadows the emotional burden Kaoru carries throughout the story.

Kaoru carries deep guilt over his sister's death, exacerbated by his father's constant blame. His greatest wish is to resurrect Karen, believing it would restore his broken family and absolve his guilt.

The emotional weight of Karen's loss is established early through Kaoru's family turmoil.

The tunnel does not grant wishes in the traditional sense. Instead, it allows people to confront and address what they have lost. Kaoru discovers this truth and realizes the tunnel cannot bring his sister back, but can help him process his grief and find closure.

This revelation comes through Kaoru's message to Anzu, explaining the tunnel's true nature.

Anzu had a childhood dream of becoming a famous manga artist, but her father dismissed her work without consideration. The abandoned manga they find in the tunnel represents her forgotten potential, which Kaoru encourages her to reclaim.

The discovery of Anzu's hidden manga reveals her suppressed artistic ambitions.

Kaoru leaves a message explaining that the tunnel offers no wishes but instead helps people face what they've lost. He encourages Anzu to pursue her manga dreams and accept that he must find his own way forward, revealing his acceptance of grief.

This message marks a turning point where both characters must choose their paths.

Kaoru's father directs his grief and anger at Kaoru, unfairly holding him responsible for the family's breakdown after Karen's death. This unjust blame creates Kaoru's deep emotional turmoil and drives him to seek the tunnel's help.

This family conflict is established early when Kaoru's father explodes in rage.

When Kaoru falls back into the tunnel and reunites with Anzu, he emerges 13 years and 102 days after his initial descent. This massive time jump occurs during their transcendent reunion and kiss inside the tunnel.

The time manipulation was established early with the hour-to-week ratio.

Eight years later, Anzu has become a moderately successful manga artist, but her passion has faded due to bitterness and fatigue from the years of longing. She stands at Kasaki Station thinking of Kaoru and her failed tunnel attempt, until she receives his message giving her hope.

The epilogue reveals how their separation affected Anzu's artistic journey.

When Kaoru accidentally falls back into the tunnel, time halts and darkness surrounds him. Anzu's warm presence reignites his consciousness, and they share a poetic kiss that intertwines their fates. This moment allows Kaoru to emerge from the tunnel transformed.

Their connection has been building throughout their tunnel explorations.

While Anzu initially seems focused on her manga career, her true desire revealed in the tunnel is to be with Kaoru. She confesses this heartbreak when she believes he is leaving, showing that her emotional connection outweighs her professional ambitions.

Their growing bond throughout the story leads to this confession.

After Kaoru and Anzu's summer festival date, Kaoru returns home to discover his father has remarried and introduced a new stepmother into their lives. This new presence represents another change in Kaoru's family dynamic and adds to his desire to escape his difficult home situation.

This event prompts Kaoru to ask Anzu to delay their final tunnel journey.