Plot
Taking place at the same time as the events of Odd Taxi, two detectives from the Ibusuki Detective Agency (IDA), Rena and Sato, are tasked to investigate whether a banker's having an affair. But when Dobu steals the evidence, the two are forced to take up another job when Taeko Harada wants them to tail Hiroshi Odokawa and find out the extent of his involvement with the missing girl in Nerima.
Rena subsequently gets involved because she knows the missing girl on a personal level.

Characters
Rena : A private investigator who works at the Ibusuki Detective Agency. She's the partner of Sato, who's recently recruited to the IDA.
Sato : A new recruit to the IDA. He's known for getting into unusual situations.
Ibusuki : The head of the IDA.
Sekido : A fixer who assists Rena and Sato in their detective work.