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Kento Nakajima as , a 24 years old university graduate who quits his first job and decided to follows his childhood dream as a hero. He is the type who carefully thinks before taking an action. His name is a play on words on a kansai accent expression, "honma kai?!" (seriously?!). •
Sho Hirano as , Kai's roommate who is an exact opposite of Kai; someone who takes action before actually thinking. He had an older brother who wanted to be a police officer, and decided to take his place instead. •
Michiko Kichise as , Kai and Jiro's strict assistant teacher who teach practical skills such as self defence and physical training. •
Yuri Nakamura as •
Taizo Harada as •
Yūsuke Iseya as
Guest cast •
Youko Maki as Megu (ep 01) •
Mone Kamishiraishi as Ami (ep 02, 03) •
Masaya Katō as Shibamoto (ep 02, 03) •
Shugo Oshinari as Yubisuke Yubitomo (ep 04) •
Misako Renbutsu as Rinka Mochizuki (ep 05) •
Dori Sakurada as Shiraki (ep 05) •
Tsutomu Takahashi as Detective Maruhashi (ep 05) •
Jouji Shibue as Detective Konpon (ep 05) •
Kyoko Hasegawa as Naoko Tenma (ep 06–07) • Hayato Kakizawa as Tomoya Tenma (ep 06–07) •
Houka Kinoshita as Police Commander Kunieda (ep 06–07, 09–10) • Satoru Matsuo as Seiji Nonomura (ep 08) • Ginpunchō as Reiko Nonomura (ep 08) • Hannya as Kato (ep 08) • Kazuma Yamane as Detective Sunaoka (ep 09–10) • Mayuko Nishiyama as Harumi (ep 10) • Mao as Kamio Mai (ep 10) ==Episodes==