At approximately 10:00 a.m., officers from raided casino Spice and arrested Takashi Nakamura, the 35-year-old manager, and four other male employees for operating a wagering facility for profit.
Nakamura and three other suspects have reportedly admitted to the allegations while the fifth suspect has denied involvement.
Officers also seized four baccarat tables and one roulette wheel from Spice, which is located on the fourth floor of multi-tenant building.
Police also questioned nine male and female customers inside the premises on suspicion of partaking in illegal gambling.
Since opening in March, Spice collected 170 million yen in revenue, according to TBS News (May 14).
The 24-hour operation utilized a security camera at the entrance to monitor customers entering the premises.