Nishio (西尾) is an antagonist in the Lost Judgment expansion, The Kaito Files. He is a member of the college event club Rhizome, and by extension, a junior member of it's organized crime syndicate, Crimson Lotus.
Nishio has his hair dyed neon blue.
Nishio was ordered to ask around Chiba for the location of Mikiko Sadamoto to ensure she was murdered. One of the people he asked was Yasutaka Shirakaba, a doctor who stated Mikiko had passed away, and he had analyzed the corpse to be sure.
Nishio ended up taking care of a dog for Shusuke Kenmochi after its owner refused to leave the property.
The Kaito Files: 2022
Upon discovering Jun Sadamoto and Masaharu Kaito, Nishio is ordered to tail them over a phone call. He follows them to Shirakaba Clinic and brings many Crimson Lotus members with him. Once there, he tells Shirakaba his lies will not work this time. Kaito insists on getting in his way, making Nishio call the member to fight him. After their defeat, Shusuke Kenmochi arrives and also loses to Kaito. Nishio, after seeing Kenmochi vomit from drinking too much after the fight, has the group back away.
Nishio attends his yearly college reunion, drinking wine from the founders' table. He notices Kaito has come to intrude, and he and his men move to take him out. Several reunion attendees die after vomiting blood, and when Nishio reaches the roof to inform Kenmochi, he vomits blood, as a result of the wine he drank being poisoned by Kyoya Sadamoto as part of his plan to erase his ties to Crimson Lotus. Nishio dies to the poison.