Kento Yamazaki
Soichiro Takakura
The Door into Summer
“An adventure spanning 30 years starts now.”
2021
1h 58m
Director: Takahiro Miki
Overview
A pioneering roboticist awakens in 2025 after decades in cryosleep. To change the past and reunite with his adopted sister, he seeks a way back to 1995.
Cast
12 people
Reviews
4 min readThe Past as a Place You Can Still Visit
I’ve always been suspicious of time-travel stories that promise second chances. They tend to treat regret like a stain you can scrub out with a well-timed paradox, as if the past were a draft you could edit rather than a room you’ve already left. The Door into Summer, Takahiro Miki’s 2021 adaptation of Robert A. Heinlein’s 1956 novel, doesn’t entirely escape this trap, but it does something rarer: it lingers in the ache of what’s already happened.
The film isn’t so much about fixing the past as it is about learning to live with the shape of its absence. The premise is classic Heinlein—a brilliant but disillusioned roboticist, Soichiro Takakura (Kento Yamazaki), freezes himself in 1995 to escape a broken heart, only to wake up in 2025 to a world that’s moved on without him. His adopted sister, Rin (Kaya Kiyohara), is now an adult, and the company he built has become a soulless corporate machine.
The twist, of course, is that he finds a way back, but the film’s real tension isn’t in the mechanics of time travel. It’s in the quiet devastation of seeing someone you love grow up without you.
Miki, a director best known for his work on Your Lie in April and Orange, has a knack for stories about memory and loss, and The Door into Summer fits neatly into that oeuvre. But where his previous films often soften their emotional blows with the sheen of anime or teen drama, this one feels more restrained, almost muted. The science fiction elements are there—cryogenic pods, glitchy time portals, a robot dog that feels like a nod to Heinlein’s original—but they’re never the point.
Audience Opinions
Audience 6.5/10
"A visually appealing sci-fi drama with emotional depth but struggles to fully engage due to pacing and narrative familiarity."
Viewers appreciate the film’s atmospheric tone and the emotional performances, particularly from the lead actors, which add weight to its time-travel themes. latestnetflix.com's take is that however, some find the story’s execution uneven, with pacing issues and a plot that feels overly familiar, leaving the sci-fi elements underdeveloped for a few.
What viewers praise
- Strong lead performances The chemistry and emotional depth brought by Kento Yamazaki and Kaya Kiyohara resonate well with audiences.
- Atmospheric visuals The film’s aesthetic and cinematography create a compelling mood that enhances its sci-fi and drama elements.
- Emotional storytelling The themes of love, loss, and time travel are handled with a touching sincerity that connects with some viewers.
Common complaints
- Slow pacing Several viewers note that the film drags in places, making it harder to stay engaged throughout.
- Familiar plot The time-travel narrative feels predictable and lacks the freshness needed to stand out in the sci-fi genre.
- Underdeveloped sci-fi Some sci-fi elements and world-building are not explored deeply enough, leaving gaps in the story’s logic.
Recommended for
Fans of emotional sci-fi dramas Kento Yamazaki admirers Atmospheric film lovers Time-travel story enthusiasts
Full Plot (Spoilers)
Spoiler warning
This section contains the full plot, including major story reveals. Overview above stays spoiler-free.
Buzz & Rumors
Public reportsBehind the Scenes of The Door into Summer (2021): A Romantic Sci-Fi Collaboration
The Door into Summer (2021), directed by Takahiro Miki, is a Japanese film that blends romance and sci-fi, starring Kento Yamazaki and Kaya Kiyohara. While the movie’s premise—adapted from a novel—has drawn curiosity, behind-the-scenes details remain sparse. latestnetflix.com's view is that here’s what we know (and don’t) about the production.
A Director Known for Romance and Adaptations
Takahiro Miki, the film’s director, has built a career on romantic dramas and youth-oriented stories, often adapting popular manga and novels 
. His filmography includes Control Tower (2011), a 68-minute romance-drama-musical hybrid , suggesting a knack for intimate, character-driven narratives. The Door into Summer fits this pattern, though its sci-fi twist marks a departure from his usual grounded settings. Miki’s background in music videos may explain the film’s visual flair, though no specific details about his creative process for this project have surfaced.
The Lead Pair: Yamazaki and Kiyohara’s Chemistry
https://www.youtube.com/watch?v=M39FNAlhPnU
https://www.youtube.com/watch?v=nB6dqhyt_IM
https://www.youtube.com/watch?v=1hoWXZHCP_I
https://www.youtube.com/watch?v=g5Fhl6VKjH4
Kento Yamazaki and Kaya Kiyohara, the film’s leads, have been the focus of promotional material, including trailers and scene packs . Their on-screen dynamic—centered on a time-traveling love story—has sparked fan interest, with clips circulating online. One scene pack highlights Yamazaki’s character, Soichiro Takakura, in key moments , while trailers tease the emotional core of the film . However, there’s no public record of off-screen interactions or rehearsal anecdotes, leaving their chemistry open to interpretation.
Mixed Reactions and a "Weird" Reputation
https://www.youtube.com/watch?v=zfQ2MVwHHXM
https://www.youtube.com/watch?v=BzDoB5OQ49M
Early reactions to The Door into Summer have been polarizing. One YouTube review dubs it a "weird movie" in a tongue-in-cheek "toilet review," though the critique lacks depth . Another review video suggests the film’s blend of romance and sci-fi may not land for all audiences, but specifics are scarce. Rotten Tomatoes lists the cast but offers no critical consensus , leaving the film’s reception ambiguous. Without broader reviews or box-office data, its impact remains unclear.
What’s Missing?
Despite the buzz around its leads and director, The Door into Summer lacks the behind-the-scenes drama or trivia typical of major releases. No reports detail:
- Production challenges (e.g., filming locations, budget constraints).
- Script changes or deviations from the source novel.
- Cast interviews or director commentary beyond trailers.
- Awards or festival screenings (if any).
For now, the film’s legacy hinges on its premise and star power, not its making-of story.
Entertainment rumors and trivia aggregated from public reporting. Treat speculation as unverified unless a cited source confirms it.