Character Relationship Map: Under the Same Moon

Characters

• Tetsuya Kumagawa (played by Yosuke Kubozuka) — protagonist

  Tetsuya is a medical trainee who witnesses the difficulties of heart surgery and meets Emi, a young woman with a serious heart condition. Though not yet qualified to operate on her, he promises to bec...

• Emi Sugiyama (played by Meisa Kuroki) — supporting

  Emi is a young woman with a serious heart condition who has undergone two operations without improvement. She hopes to move forward and seeks treatment at a hospital in Tokyo. Close friends with Tetsu...

• Don (played by Edison Chen) — supporting

  Don is a man connected to Emi’s past who escapes from prison and becomes entangled with dangerous former associates, including Yusaku Kaneko. Despite the risks, he keeps a drawing intended for Emi and...

• Yusaku Kaneko (played by Taro Yamamoto) — supporting

  Yusaku is one of Don’s former associates and is involved in the dangerous dealings surrounding Don’s escape. He and others blame Don for a failed arrangement and try to force him to take responsibilit...

• Emi Sugiyama (young) (played by Mayuko Fukuda) — supporting
• Tetsuya Kumagawa (young) (played by Kenji Shio) — supporting

Story Dynamics

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

• Tetsuya Kumagawa (young) → Emi Sugiyama (young) (Social Childhood Friends) — The childhood versions of Tetsuya and Emi are associated with the friendship that Tetsuya reflects on near the end.

  The closing events place Tetsuya at a location associated with his childhood and his friendship with Emi.

• Don → Yusaku Kaneko (Conflict Hostile Associates) — Kaneko and other former associates pressure Don over a failed arrangement while Don is evading them.

  The plot says Don has dangerous dealings with former associates, including Yusaku Kaneko, who blame Don for a failed arrangement and try to force him...

• Tetsuya Kumagawa → Don (Conflict Rivalry) — Their conflict over Don's connection to Emi escalates into a fight, but Tetsuya still ensures Don receives medical care.

  Tetsuya confronts Don, accuses him of interfering with his relationship with Emi, and the argument becomes physical. Don is injured, and Tetsuya later...

• Don → Emi Sugiyama (Unknown Complicated Past Connection) — Don's attempt to reach Emi with the drawing ties him to her past, though the precise nature of their connection is not specified.

  The plot calls Don a man connected to Emi's past and says he keeps a drawing intended for her and insists on delivering it.

• Tetsuya Kumagawa → Emi Sugiyama (Social Close Friends) — Tetsuya promises to become a doctor and find a way to help Emi, while their friendship remains central to both of them.

  The plot describes Tetsuya and Emi as sharing a close friendship, and says Emi speaks openly with him about her fears and hopes.

Story Analysis

A young aspiring doctor, a seriously ill friend, and a man from her past are bound by promises, danger, and unresolved hopes.

Plot Progression

1. A Promise Beside the Hospital Bed — Tetsuya witnesses the difficulty of heart surgery and learns about Emi's serious condition and failed operations. Emi chooses to seek treatment in Tokyo, and Tetsuya promises to become a doctor who ca...
2. An Escape Reopens the Past — Don's escape brings police attention to the hospital and prompts a warning for Emi to deny any connection to him. Don also faces pressure from former associates, including Kaneko, over a failed arrang...
3. The Drawing and the Fight — Don remains intent on delivering a drawing meant for Emi despite the danger around him. Tetsuya confronts him, and their argument turns physical, leaving Don injured.
4. An Ambition Under Pressure — Tetsuya helps Don obtain medical attention even though doing so could bring trouble. His request to perform Emi's next operation is challenged, but he remains determined to become capable of helping h...
5. A Bond Without an Answer — Tetsuya returns to a place connected to his childhood and reflects on his bond with Emi. Don's drawing remains a token of his wish to reach her, while the closing dialogue leaves Emi's medical future...