Is The Tunnel to Summer, the Exit of Goodbyes Worth Reading? Review & Where to Read

Quick facts
Format	Manga (seinen), 6 chapters, 1 volumes
Run	2019–2019 · completed
Community score	AniList 8.2
Content	Grief, mild peril
Where to read	Seven Seas Entertainment — official

Overview

Kaoru Tono has heard the rumor his whole life: somewhere out there is the Urashima Tunnel, a passage where the normal rules of space and time don't apply. Walk through it, the story goes, and you'll find your heart's deepest wish waiting on the other side — but it comes at a cost measured in years of your own life. Kaoru has a wish he's desperate enough to pay that price for. Then he meets Anzu Hanashiro, a new transfer student with a very different reason for wanting to find the same tunnel, and the two of them end up searching for it together.

The manga, subtitled Ultramarine, adapts Mei Hachimoku's original light novel with new art by Koudon, running for four volumes in Shogakukan's Monthly Sunday Gene-X. It shares its source material with the well-received 2022 anime film, but tells the story through its own pacing and art rather than retreading the movie panel for panel.

What it does well

The central premise is doing a lot of work, and it holds up. A wish granted at the cost of your own years is the kind of sci-fi hook that could easily stay abstract, but the manga keeps grounding it in what Kaoru and Anzu are actually willing to give up and why, which turns a clever concept into a real emotional question.

Keeping Kaoru's and Anzu's motivations separate for a stretch of the story is a smart structural choice. Both of them clearly want something badly enough to risk the tunnel's price, but the manga takes its time letting the reader — and the two leads — understand exactly what that something is, so the moment their reasons start to intersect actually means something instead of just being a plot mechanism.

Koudon's art is well suited to the material, particularly in the quieter scenes between the two leads, where a lot of the emotional weight is carried by small gestures and expressions rather than dialogue. And because the whole story runs a tight four volumes, there's very little padding — almost every chapter is pulling its weight toward the ending.

Where it falls short

That same compact length is a trade-off. World details and side characters get comparatively little space, and a couple of the story's later reveals move fast enough that they land more as information than as fully earned emotional beats, especially if you're coming to this cold without the film or novel as a reference point.

The story's central metaphor about what we're willing to trade for what we want also gets stated fairly plainly by the end, which lands emotionally but leaves less ambiguity than the premise's opening chapters seem to promise.

Verdict

The Tunnel to Summer, the Exit of Goodbyes is a small, well-constructed sci-fi romance that knows exactly how long it needs to be and doesn't overstay that length. If a tight, bittersweet story about what you'd trade for your deepest wish sounds appealing, this delivers it efficiently and sincerely; if you want a sprawling cast or a slow-burn world to get lost in, look elsewhere.