捜査第四課 そうさだいよんか Also written 捜査第4課 Meanings Noun Fourth Investigation Division (of the Japanese police) (i.e.: division responsible for investigating organized crime and the yakuza) See also: 捜査四課 (そうさよんか). Kanji 捜 search. Read as ソウ. 査 examine 第 No.. Read as ダイ. 四 four. Read as よん. 課 lesson. Read as カ. Jinuma: Japanese Dictionary · Word lists