Hiroki Oi

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| **Hiroki Oi** | |
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| **Profile** | |
| Japanese name: | 大井 宏樹   (Ōi Hiroki) |
| Age: | 36 |
| Gender: | Male |
| Occupation: | Lawyer |
| Status: | Alive |
| **Statistics** | |
| First appearance: | Anime: [Episode 1050](/wiki/Intrigue_at_Morikawa_Mansion "Intrigue at Morikawa Mansion") |
| Appearances: | Episodes: (/wiki/Hiroki_Oi_Appearances "Hiroki Oi Appearances") |
| Cases solved: | 0 |
| **Actors** | |
| Japanese voice: | [Kenji Nomura](/wiki/Kenji_Nomura "Kenji Nomura") |
**Hiroki Oi** (大井 宏樹 ,*Ōi Hiroki*[?](/wiki/Help:Japanese "Help:Japanese")) is a character in the anime franchise *[Detective Conan](/wiki/Detective_Conan "Detective Conan")*.
## Contents
* [1 Background](#Background)
* [2 Personality](#Personality)
* [3 Appearance](#Appearance)
* [4 Appellations](#Appellations)
* [5 Plot overview](#Plot_overview)
+ [5.1 Intrigue at Morikawa Mansion (Anime: 1050-1051)](#Intrigue_at_Morikawa_Mansion_.28Anime:_1050-1051.29)
+ [5.2 The Boiled Fugu Mystery Tour Showdown (Anime: 1074-1075)](#The_Boiled_Fugu_Mystery_Tour_Showdown_.28Anime:_1074-1075.29)
+ [5.3 The Glassy Water's Surface (Anime: 1174-1175)](#The_Glassy_Water.27s_Surface_.28Anime:_1174-1175.29)
* [6 Different looks](#Different_looks)
* [7 Name origin](#Name_origin)
* [8 See also](#See_also)
## Background[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=1 "Edit section: Background")]
Hiroki Oi is a lawyer in Tokyo.
## Personality[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=2 "Edit section: Personality")]
He is initially shown as a serious man who was only doing his job, but in his second appearence is more friendly. He knows and appreciates [Conan](/wiki/Conan_Edogawa "Conan Edogawa")'s intelligence and deductive skills.
## Appearance[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=3 "Edit section: Appearance")]
He is a tan-skinned tall man with wavy black hair. He wears a formal black suit.
## Appellations[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=4 "Edit section: Appellations")]
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| Picture | Name | What they call Hiroki Oi | What Hiroki Oi calls them |
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|  | [Conan Edogawa](/wiki/Conan_Edogawa "Conan Edogawa") | Oi-san   Lawyer Oi (*Oi-bengoshi*) | Conan-kun   Little detective   Great detective (*Meitantei*) |
|  | [Kogoro Mouri](/wiki/Kogoro_Mouri "Kogoro Mouri") | Oi-san | Detective Mouri (*Mouri-tantei*) |
|  | [Ran Mouri](/wiki/Ran_Mouri "Ran Mouri") | - | Ran-san   The daughter (*Ojō-san*) |
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## Plot overview[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=5 "Edit section: Plot overview")]
### Intrigue at Morikawa Mansion (Anime: [1050-1051](/wiki/Intrigue_at_Morikawa_Mansion "Intrigue at Morikawa Mansion"))[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=6 "Edit section: Intrigue at Morikawa Mansion (Anime: 1050-1051)")]
[Kogoro](/wiki/Kogoro_Mouri "Kogoro Mouri"), [Ran](/wiki/Ran_Mouri "Ran Mouri"), and Conan are invited by a chairman, whose body has been consumed by late-stage cancer, to his mansion in a remote island under Tokyo jurisdiction, asking the detective to help him. Meanwhile, his lawyer is also one of the participants rewriting the will. He secretly monitores every actions made by the three sons, to see who genuinely deserves the legacy. However, he breaks the entrustment contract set by the owner and calls the police beforehand, to allow them to approach the island as soon as possible.
### The Boiled Fugu Mystery Tour Showdown (Anime: [1074-1075](/wiki/The_Boiled_Fugu_Mystery_Tour_Showdown "The Boiled Fugu Mystery Tour Showdown"))[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=7 "Edit section: The Boiled Fugu Mystery Tour Showdown (Anime: 1074-1075)")]
Lawyer Oi informing the case details to Conan.
He introduces Kogoro, Ran, and Conan to visit Shimonoseki. At the beginning, he shares the detail information regarding the case exclusively to Conan, owing to the fact that he solved the preview case. However, this was interrupted by Kogoro, because thinking he must be the sole detective here. He then provides supports for Conan's case investigation and sees him telling the deduction. Although Conan proclaims that all of the deductions came from Kogoro, he surely knows Conan is not a commonplace kid.
### The Glassy Water's Surface (Anime: [1174-1175](/wiki/The_Glassy_Water%27s_Surface "The Glassy Water's Surface"))[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=8 "Edit section: The Glassy Water's Surface (Anime: 1174-1175)")]
Hiroki Oi meets Kogoro, Ran and Conan at the [Mouri Detective Agency](/wiki/Mouri_Detective_Agency "Mouri Detective Agency") to ask for his help in solving a mysterious death for his client Kanta Tsuji, who lives in northern Kyoto Prefecture. He briefs them about the whereabouts of the victim and the fact the he died two weeks prior in a death seemingly related to the folk legend of [Urashima Tarō](http://en.wikipedia.org/wiki/Urashima_Tar%C5%8D "wikipedia:Urashima Tarō") and hands the Mouris a children's book. Kogoro accepts the case and the three head to Kyoto Prefecture. Later, Conan calls Oi to inform him that he has made some progress and asks Oi, who is answering the phone from his car, about details from the case, which he provides. Following the death of one of the suspects, Conan calls Oi again with questions about the suspects. At the end of the case, Conan tells him that the case was solved, which he thanks him for, and gives him a box of [Kyoto Yatsuhashi](http://en.wikipedia.org/wiki/Yatsuhashi "wikipedia:Yatsuhashi") sweets as souvenirs.
## Different looks[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=9 "Edit section: Different looks")]
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| Episodes 1174-1175 |
## Name origin[[edit](/wiki/index.php?title=Hiroki_Oi&action=edit&section=10 "Edit section: Name origin")]
Screenplay writer [Akatsuki Yamatoya](/wiki/Akatsuki_Yamatoya "Akatsuki Yamatoya") discloses on his personal horse racing blog that this character is named after one of his drinking friends:
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| “ | As an employee of a certain farm, he appeared as a lawyer in anime. If anyone's from that farm, and you watch this episode, please assure to recognize him and make jokes like, "Oh, lawyer!" | „ |
| — Original remark by Yamatoya | | |