|occupation        = Detective

|occupation        = Detective

|affiliation=[[Heinous Crimes Unit]]

|affiliation=[[Heinous Crimes Unit]]

|weapon            = SIG SAVER P229

|weapon            = SIG SAUER P229

|status= Alive

|status= Alive

|first            = {{CL|1}}

|first            = {{CL|1}}

By 1994 Sumio had successfully been recruited into the [[Heinous Crimes Unit]] where is assigned to Unit 2 and met his partner [[Tetsugoro Kusabi]]. The two got off to a rough start but soon formed a tight bond despite Kusabi's volatility. Sumio's first case with the HCU was the Power Girl Case which involved a terrorist bomber on the east side of [[Ward 24]]. Details on this case are vague but it is known that Sumio shared some sort of romantic relationship with the main suspect. Sumio continued his work with the HCU contributing on the 1998 Gas Kids case as well as other non-specified cases.

By 1994 Sumio had successfully been recruited into the [[Heinous Crimes Unit]] where is assigned to Unit 2 and met his partner [[Tetsugoro Kusabi]]. The two got off to a rough start but soon formed a tight bond despite Kusabi's volatility. Sumio's first case with the HCU was the Power Girl Case which involved a terrorist bomber on the east side of [[Ward 24]]. Details on this case are vague but it is known that Sumio shared some sort of romantic relationship with the main suspect. Sumio continued his work with the HCU contributing on the 1998 Gas Kids case as well as other non-specified cases.

===The Silver Case===

===''The Silver Case''===

Sumio is first mentioned by Kusabi during [[Case 0 Lunatics|case#00:Lunatics]] after he is fired upon by a crazed [[Ryo Kazan]]. [[Chizuru Hachisuka]] however mentions that Sumio had already left the office for the night. This is shown in the supplemental manga [[Pre-Lunatics]], which shows Sumio awakening from a nap with a "bad feeling" before quickly leaving for a meeting with the [[Mikumo Boys]].

Sumio is first mentioned by Kusabi during [[Case 0 Lunatics|case#00:Lunatics]] after he is fired upon by a crazed [[Ryo Kazan]]. [[Chizuru Hachisuka]] however mentions that Sumio had already left the office for the night. This is shown in the supplemental manga [[Pre-Lunatics]], which shows Sumio awakening from a nap with a "bad feeling" before quickly leaving for a meeting with the [[Mikumo Boys]].

[[File:sumiogun.png|thumb|80px|Confronting [[Ayame Shimohira|Ayame]]]]

[[File:sumiogun.png|thumb|80px|Confronting [[Ayame Shimohira|Ayame]]]]

The following day Sumio is finally apprehended by Kusabi and Akira outside of [[Mikumo 77]]. As the three men watch Mikumo get destroyed Sumio explains his desire to [[Kill the Past]] and that his entire self was trapped in the past. The two former partners reminisce about their first encounter with each other as Sumio is arrested.

The following day Sumio is finally apprehended by Kusabi and Akira outside of [[Mikumo 77]]. As the three men watch Mikumo get destroyed Sumio explains his desire to [[Kill the Past]] and that his entire self was trapped in the past. The two former partners reminisce about their first encounter with each other as Sumio is arrested.

===Case 4.5 : FACE===

===''Case 4.5 : FACE''===

[[File:Sumioprison.png|thumb|150px|Sumio during his time in prison]]

[[File:Sumioprison.png|thumb|150px|Sumio during his time in prison]]

Shortly after the events of [[Case 4 Kamuidrome|case#04 Kamuidrome]] Sumio is still incarcerated due to the events of [[Case 3 Parade|case#03 Parade]]. While incarcerated he is interviewed by [[Sakura Natsume]] as part of her training. During their first interview Sumio showed himself to be cold, emotionless and unhelpful. Initially Sakura attempts to ask him about his crimes but he rebukes her arguing that analyzing the past is pointless in the context of investigating heinous crimes. He ascertains that searching for meaning in all things is an incorrect method of investigation much to Sakura's annoyance. Once Sakura mentioned [[Tetsugoro Kusabi]] however, his demeanor changed completely to something resembling his older 'self'. Sakura soon asks Sumio why a seasoned and respected detective would commit a crime like he did. Sakura tells Sumio that she believes crime is something that needs to be eradicated however Sumio argues that an inability to connect with your own inner darkness makes it impossible to understand the nature of crime and how crimes are committed.

Shortly after the events of [[Case 4 Kamuidrome|case#04 Kamuidrome]] Sumio is still incarcerated due to the events of [[Case 3 Parade|case#03 Parade]]. While incarcerated he is interviewed by [[Sakura Natsume]] as part of her training. During their first interview Sumio showed himself to be cold, emotionless and unhelpful. Initially Sakura attempts to ask him about his crimes but he rebukes her arguing that analyzing the past is pointless in the context of investigating heinous crimes. He ascertains that searching for meaning in all things is an incorrect method of investigation much to Sakura's annoyance. Once Sakura mentioned [[Tetsugoro Kusabi]] however, his demeanor changed completely to something resembling his older 'self'. Sakura soon asks Sumio why a seasoned and respected detective would commit a crime like he did. Sakura tells Sumio that she believes crime is something that needs to be eradicated however Sumio argues that an inability to connect with your own inner darkness makes it impossible to understand the nature of crime and how crimes are committed.

After the death of Minato Sawaguchi and the end of the Jack the Ripper case; Sakura meets Sumio in prison one last time. The two finished their discussion about inner darkness. She thanks him for his help as Sumio declares they probably will never meet again.

After the death of Minato Sawaguchi and the end of the Jack the Ripper case; Sakura meets Sumio in prison one last time. The two finished their discussion about inner darkness. She thanks him for his help as Sumio declares they probably will never meet again.

===Flower, Sun, and Rain===

===''Flower, Sun, and Rain''===

:''Main article: [[Sumio Mondo]]''

:''Main article: [[Sumio Mondo]]''

Following the events of ''Flower, Sun, and Rain'', Sumio was re-integrated into the Heinous Crimes Unit, and worked on a number of cases. He and Kusabi investigated the "Hyena Shot" case, in which the imaginary hitman Genichiro Hara actually exists. The two eventually uncovered Hara's true identity. He later participated in the "Life & Money", "Animal Hunting", "Door Lock", "Angel X", and "Cut Doctor" cases.

Following the events of ''Flower, Sun, and Rain'', Sumio was re-integrated into the Heinous Crimes Unit, and worked on a number of cases. He and Kusabi investigated the "Hyena Shot" case, in which the imaginary hitman Genichiro Hara actually exists. The two eventually uncovered Hara's true identity. He later participated in the "Life & Money", "Animal Hunting", "Door Lock", "Angel X", and "Cut Doctor" cases.

===The 25th Ward: The Silver Case===

===''The 25th Ward: The Silver Case''===

[[File:SumioSakura.png|thumb|150px|Investigating [[Kosuke Kurumizawa]]]]

[[File:SumioSakura.png|thumb|150px|Investigating [[Kosuke Kurumizawa]]]]