Character Relationship Map: Masquerade Night

Characters

• Kosuke Nitta (played by Takuya Kimura) — protagonist

  Kosuke Nitta is the detective assigned to investigate a brutal murder after a warning places the killer at Hotel Cortesia’s New Year’s Eve party. He searches the masked crowd, questions suspicious gue...

• Naomi Yamagishi (played by Masami Nagasawa) — supporting

  Naomi Yamagishi is the concierge of Hotel Cortesia and a central figure in managing the crisis during the masked celebration. She insists that staff protect every guest’s privacy and dignity during th...

• Midori Nakane (played by Kumiko Aso) — supporting

  Midori Nakane checks into Hotel Cortesia under an assumed identity, claiming that she is celebrating her husband’s birthday. Kosuke Nitta discovers that her husband is actually dead and that she reser...

• Atsuya Kusakabe (played by Ikki Sawamura) — supporting

  Atsuya Kusakabe is a hotel guest who arranges a private dinner and prepares a proposal surrounded by roses during the New Year’s Eve celebration. His romantic plan forms one of the hidden personal sto...

• Machiko Sono (played by Yoshino Kimura) — supporting

  Machiko Sono is a woman who knows that Yuri Kaizuki is involved with her husband. Consumed by anger, she becomes part of the investigation’s web of concealed relationships and later admits Yuri’s affa...

• Yuri Kaizuka (played by Saki Takaoka) — supporting
• Masaaki Sono (played by Masanobu Katsumura) — supporting

Canonical Relationships

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

• Kosuke Nitta → Machiko Sono (Professional Investigator And Informant)

  Under pressure, Machiko admits that Yuri was seeing another man, providing information relevant to Nitta's investigation.

• Atsuya Kusakabe → Naomi Yamagishi (Professional Guest And Concierge)

  Atsuya arranges a private dinner and proposal at the hotel, where Naomi serves as concierge.

• Masaaki Sono → Yuri Kaizuka (Romantic Affair Partners)

  Machiko admits that Yuri was seeing another man, and the investigation identifies that man as connected to Machiko's marriage through her husband.

• Machiko Sono → Masaaki Sono (Family Married Couple)

  Machiko knows that Yuri is involved with her husband, and the character list identifies her husband as Masaaki Sono.

• Naomi Yamagishi → Midori Nakane (Professional Guest And Concierge)

  Midori checks into Hotel Cortesia under an assumed identity, while Naomi represents the hotel's commitment to protecting every guest's privacy and dig...

• Kosuke Nitta → Naomi Yamagishi (Professional Counterpart)

  Kosuke Nitta investigates the guests at Hotel Cortesia, while Naomi Yamagishi is the concierge defending the hotel's duty to protect guest privacy and...

Story Dynamics

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

• Atsuya Kusakabe → Kosuke Nitta (Unknown Subject Of Inquiry)

  Atsuya arranges a private dinner and a rose-filled proposal while Nitta investigates hidden motives among the hotel guests.

• Yuri Kaizuka → Kosuke Nitta (Narrative Investigator And Subject)

  The investigation turns toward Yuri, who is expected to meet a married man at the party, and Nitta searches the masked crowd after she disappears.

• Machiko Sono → Yuri Kaizuka (Conflict Jealous Rivals)

  Machiko knows Yuri is involved with her husband and becomes consumed by anger.

• Kosuke Nitta → Midori Nakane (Conflict Investigator And Suspect)

  Nitta discovers that Midori's husband has died and later exposes her pretense about celebrating his birthday.

Story Analysis

A murder investigation at a masked hotel celebration exposes the conflict between suspicion, privacy, grief, and the belief required to serve guests.

Plot Progression

1. The Countdown Warning
2. Privacy Behind Masks
3. Grief in Room Memory
4. Secrets in the Crowd
5. Truth Before Midnight