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- Main article: IS-7 Incident
Detective Shirase was initially in charge of the IS-7 investigation. He reported to Chief Prosecutor Bansai Ichiyanagi that the victim's body had gone missing. However, this information failed to reach the lead prosecutor for the case, Manfred von Karma. Shirase was eventually replaced by Tyrell Badd, but was still placed in charge of interrogations.
Von Karma arrested Issei Tenkai for the murder before learning that the body had gone missing, and tried to keep this fact under wraps. Tenkai's defense attorney, Gregory Edgeworth, found out about this, but von Karma managed to obtain a forged autopsy report thanks to Ichiyanagi's meddling. The subsequent trial lasted a year, until von Karma had Shirase threaten Tenkai: confess, or Tsukasa Oyashiki would be indicted instead. Tenkai indeed confessed to being an accomplice, but Badd secretly recorded the confession and gave the recording to Edgeworth to use as a "secret weapon". The recording proved that Tenkai's confession had been forced, and while Edgeworth lost the trial, von Karma received the only penalty in his "perfect" record. However, it was Shirase that took the brunt of the blame and was soon fired.
Shirase's name in the unofficial English fan translation patch for Gyakuten Kenji 2 is "Rip Lacer". This is a play on "replacer", which references the fact he was replaced by, and later replaced, Tyrell Badd.