Character Relationship Map: Heat Wave

Characters

• Rin Jyoshima (played by Kanako Higuchi) — protagonist

  Rin is a fearless gambler from a peasant family who supports herself through gambling. In Osaka, she helps Ichitaro by paying part of his debt and promising to cover the rest, then becomes involved in...

• Tsunejiro Murai (played by Tatsuya Nakadai) — supporting

  Tsunejiro is a celebrated gambler representing the Iwabune Family in a contest among powerful gang families. He initially seems nearly unbeatable, but Rin challenges him in the final contest. He revea...

• Koyoshi (played by Keiko Oginome) — supporting

  Koyoshi hopes to regain control of Yagumo and risks her savings in a major gambling game, hoping to turn 700 yen into enough to buy it back. Later, Rin finds her with Ichitaro at a meeting place where...

• Ichitaro Kosugi (played by Masahiro Motoki) — supporting

  Ichitaro is accused of fleeing a gambling debt of 300 yen, and Rin pays what she can while promising to cover the rest. He has become involved with Yagumo, and later hides nearby while in danger. Rin...

• Kosugi (played by Kazuo Kitamura) — minor

Canonical Relationships

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

• Rin Jyoshima → Kosugi (Family Daughter And Father) — Kosugi taught Rin to gamble while they traveled together; Tsunejiro's revelation connects Rin's past to the current contest.

  Tsunejiro's story about killing a gambler in front of the man's young daughter makes Rin recognize the dead gambler as her father.

Story Dynamics

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

• Koyoshi → Rin Jyoshima (Conflict Gambling Contestants) — Both women enter the contest amid the struggle over Yagumo, though the account does not specify a direct personal feud between them.

  Koyoshi risks her savings in a major gambling game, and Rin joins the same contest.

• Koyoshi → Ichitaro Kosugi (Social Reunited Companions) — Koyoshi and Ichitaro reunite while in danger, but the account leaves their fate unresolved.

  At the meeting place, Rin finds Koyoshi with Ichitaro, and their reunion is immediately threatened by a demand that they die together.

• Rin Jyoshima → Tsunejiro Murai (Conflict Gambling Rival) — Their contest becomes personal when Rin recognizes Tsunejiro as her father's killer, although she says she has left the past behind.

  Rin joins the gambling contest in which Tsunejiro represents the Iwabune Family, and later challenges him in the decisive contest. Tsunejiro also reve...

• Rin Jyoshima → Ichitaro Kosugi (Alliance Benefactor) — Rin intervenes to help Ichitaro with his debt, drawing her into the conflict surrounding Yagumo.

  When Ichitaro is accused of fleeing a gambling debt, Rin pays what she can and promises to cover the remainder.

Story Analysis

Rin's gambling life draws her into Yagumo's struggle, a contest with Tsunejiro, and a dangerous unresolved reunion.

Plot Progression

1. Debt Draws Rin In — Rin introduces herself as a gambler and intervenes when Ichitaro is accused of fleeing a debt. She learns that his troubles connect to Yagumo.
2. The Contest for Yagumo — Koyoshi risks her savings in hopes of buying Yagumo back. Rin joins a high-stakes contest featuring Tsunejiro, whose early dominance raises the pressure.
3. A Past Comes to Light — Tsunejiro describes killing a gambler, and Rin recognizes the man as her father. She rejects revenge as the contest reaches its decisive stage, though its outcome is not stated.
4. A Reunion Under Threat — A wounded man warns Rin and gives her a weapon, while a woman reveals her intention to keep Yagumo despite providing Ichitaro's location. Rin finds Koyoshi and Ichitaro, but a threat leaves their fate...