At approximately 11:30 a.m., an employee at the shop called emergency personnel to report hearing two gunshots after a quarrel erupted among five customers, all of whom are believed to be gang members.
Police arriving at the scene, inside a business district near JR Koiwa Station, discovered two shell casings and three bloodstains.
Witnesses indicated that four of the participants departed by a car while the final member escaped on foot.
No other customers inside the cafe at the time of the shooting were injured.
Investigators are searching for the perpetrators in hopes of applying charges related to the Swords and Firearms Control Law.