Episode 1
Episode 2
Episode 3
- Watanabe Saori (渡辺早織) as Iotome Mai (Sakai's ex-girlfriend)
- Okano Ippei (岡野一平) as Iwasaki Yuto (Membership bar manager; resident who lived on the floor below Sakai)
- Kozuki Mai (小築舞衣) as Kimura Ayaka (Iwasaki's girlfriend)
- Fujita Tomohiro (藤田智大) as Hasebe Makoto (Mai's lover)
- Ishiyama Masahumi (石山和史) as police officer (Toyama Saki's colleague from 5 years ago)
- Shimazaki Yoshihisa (島崎義久) as detective, First Investigative Division
- Arai Hanpa (あらいはんぱ) as detective, First Investigative Division
- Nishi Yosuke as Misawa Isamu (Membership bar regular customer)
- Yoshida Kazumasa (吉田和正) as Kurata Daisuke (Membership bar regular customer)
- Tsuchiya Shinba (土屋神葉) as Kuzumi Kenjiro (Real estate company "KT Foundation" employee; high school friend of Yojo Takumi) (ep 3-4)
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Episode 4
- Oura Ryuichi as Shintani Jun ("KT Foundation" manager; Kenjiro's superior)
- Otaka Hiroo as Masuyama Sadao ("KT Foundation" chief; Kenjiro's superior)
- Shoji Yusuke as Saeki Naomi ("KT Foundation" former employee) (ep 4-6)
- Namiki Shiro as Sakuraba Shinichiro (Representative of residents opposing the Sumiyoshi-cho Residence construction)
- Mizuki Kaoru as Kubo Keiko (Resident opposing the Sumiyoshi-cho Residence construction)
- Kurita Yoko as Kuzumi Mitsuko (Kenjiro's mother)
- Tamura Masato (田村将人) as administrator (ep 4-6)
- Onikura Ryudai (鬼倉龍大) as Wakatsuki Kan ("KT Foundation" employee)
- Nakawaki Mikito as Kuzumi Kenichi (Kenjiro's father)
- Aida Ai as Katsura Misaki (First person to discover the body)
Episode 5-6
- Kaneda Akio as Suwa Kazuhiko (Shinjuku Higashi Police Station, Sergeant of Nishi-Waseda Police Box)
- Kuze Seika as Mori Asami (Superintendent of First Investigative Division, Tokyo Metropolitan Police Department)
- Nishiyama Jun as Yaida Osamu (Shinjuku Higashi Police Station, Sergeant of Nishi-Waseda Police Box officer)
- Shimizu Yutaka as Ishimura Takashi (Shinjuku Higashi Police Station, Nishi-Waseda Police Box, senior officer)
- Iwamoto Jun (岩本淳) as Saruwatari Eisen (Shinjuku Higashi Police Station, Chief of the Community Affairs Division)
- Yoshinari Kouichi (吉成浩一) as Wadatsumi Akira (Metropolitan Police Department, First Investigative Division, Senior Patrol Officer)
- Fujiwara Tomoyuki (藤原智之) as Munekawa Tomoharu (Metropolitan Police Department, First Investigative Division, Senior Patrol Officer)
Episode 7
- Sawada Ayako as Sawa Akiko (Snack bar "Hide" owner)
- Nishimura Kazuhiko as Abukuma Satoshi (Owner of "Yakitori Tecchan"; Tetsu's son) (ep 6-7)
- Obayashi Takeshi as Kaneshiro Kiichi (Yakitori Tecchan's regular customer)
- Yamamoto Toshihiko (山本紀彦) as Futami Sakio (Former riot police)
- Odagiri Hajime (小田桐一) as Matsuyama Denjiro (Chairman of "Delivery Go"; former riot police)
- Koyanagi Yukimi as Fujii Eiko (Snack bar "Futaba" owner)
- Kawashima Mitsuko (川島美津子) as Matsuyama Yoko (Denjiro's wife)
- Ohashi Yoshie (大橋芳枝) as Kaneshiro Etsuko (Kiichi's wife)
- Takakuwa Mitsuru as Abukuma Tetsu (Former owner of "Yakitori Tecchan"; recently died of illness) (ep 6-7)
- Takahashi Kasumi (髙橋かすみ) as Abukuma Etsuko (Tetsu's wife; Satoru's stepmother; died of illness)
- Konno Fukuta (紺野ふくた) as Matsuyama Tsuyoshi (President of "Delivery Go"; son of Denjiro and Yoko)
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