Character Relationship Map: Summer Time Machine Blues

Characters

• Takuma Komoto (played by Eita Nagayama) — protagonist

  Takuma Komoto is a science-fiction club member who hopes to invite Haruka Shibata to a movie, although she mistakenly believes he has a girlfriend. He becomes deeply involved in the time-machine crisi...

• Haruka Shibata (played by Juri Ueno) — supporting

  Haruka Shibata is a photography club member who develops pictures with Yui Ito and notices a mysterious figure in one image. She joins the effort to protect the past, helps deal with the time traveler...

• Shunsuke Koizumi (played by Daijiro Kawaoka) — supporting

  Shunsuke Koizumi is a science-fiction club member who travels into the past with Daigo Ishimatsu and another club member to recover the air-conditioner remote before it is broken. He becomes distracte...

• Atsushi Soga (played by Munenori Nagano) — supporting

  Atsushi Soga is a science-fiction club member who is placed inside the mysterious time machine and unexpectedly travels to the previous day, becoming the figure seen in Yui Ito and Haruka Shibata's ph...

• Daigo Ishimatsu (played by Tsuyoshi Muro) — supporting

  Daigo Ishimatsu is a science-fiction club member who joins Shunsuke Koizumi and another club member in traveling to the past to retrieve the air-conditioner remote before it is damaged. He forgets the...

• Akira Tamura (played by Chikara Honda) — supporting

  Akira Tamura is a science-fiction club member from August 20, 2030 who arrives in the present through the time machine. He helps explain its future connection, travels to retrieve the remote, and late...

• Yui Ito (played by Yoko Maki) — supporting

  Yui Ito is a photography club member who takes pictures of the science-fiction club and develops them with Haruka Shibata. Her photograph reveals a mysterious figure connected to the time machine, mak...

• Professor Kohtaro Hozumi (played by Kuranosuke Sasaki) — minor

  Professor Kohtaro Hozumi is the club advisor, known as Hoze, who is asked to repair the damaged air-conditioner remote. He explains that changing the past would create a grandfather paradox and make t...

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Yui Ito → Professor Kohtaro Hozumi (Professional Student) — Student and club advisor relationship.

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Yui Ito → Shunsuke Koizumi (Alliance Teammate) — Fellow student aiding in temporal stability.
• Yui Ito → Daigo Ishimatsu (Alliance Teammate) — Clubmate collaborating on timeline preservation.
• Yui Ito → Atsushi Soga (Alliance Teammate) — Fellow club member participating in time travel.
• Yui Ito → Akira Tamura (Social Observer) — Future visitor observed and analyzed by Yui Ito.
• Yui Ito → Takuma Komoto (Alliance Ally) — Supportive ally during the time travel investigation.
• Yui Ito → Haruka Shibata (Alliance Teammate) — Fellow photography club members and allies in the time travel adventure.

Story Analysis

A playful university time-travel adventure turns everyday club problems into a chain of paradoxes, legends, and future connections.

Plot Progression

1. A Remote on the Blink — The university clubs share a room, play baseball, develop photographs, and cope with a damaged air-conditioner remote. A mysterious photographic detail quietly prepares the time-travel mystery.
2. The Impossible Machine — A strange boy leaves behind a machine that unexpectedly works. The first trip into the past explains the hidden figure in the photograph and changes the club's understanding of reality.
3. History Gets Complicated — The club members try to recover the remote but become distracted by the past. A visitor from 2030 and a warning about the grandfather paradox raise the stakes.
4. The Remote Through Time — The group races to prevent changes to history while the remote passes through multiple eras. A near-drowning and a Kappa misunderstanding expand the local legend surrounding the incident.
5. A Future Takes Shape — The remote is recovered, the air conditioner can work again, and a camera reveals a possible future family connection. The advisor's inspiration and the accepted date bring the story to a warm conclus...