The date turns out to be Eri becoming a murder suspect, which Kogoro tries to forget that disgusting day. It was the day that Eri appears as a witness for a trial of a theft case of Saito Reika, a hostess working at Mint Rose bar, who was charge for stealing 10 million yen at her working safe. During that, it was the 3rd day of the trial, once Eri gives her testimony, Reika insults her. Eri uses her hand and pretends to shoot her, however Eri was terrified to see that Reika was really shot in the head. Convinced, Eri decides to threaten everyone that she's going to shoot everyone in the courtroom, however, after hearing her words, Shinichi realizes it is a hidden message. Shinichi plays along with Eri, making her as the prime suspect of the murder, both manage to make prosecutor Kamikawa Takumi say something that he shouldn't be saying, which proves to everyone that he's the real murderer. The weapon happens to be a gun that looks like a lipstick in which Takumi shoots her without anyone suspecting a thing and during the commotion, he tossed the weapon at Eri. However, Eri figures out that the lipstick she picked up was still hot and decides to give it to Shinichi after giving him a hidden message from her words. The motive of the murder was that Takumi was charged for tax-evasion against the love hotel "Peach-Peach Group" recently. Takumi assume that Reika was in love with him until she was arrested and happened to work at the same love hotel. She stole the money for his sake and threatened him if she goes to jail, she'll expose everything during that day.
Back at the white room, Ran was not happy about his father during the case while Shinichi keys in lipstick at the panel to open the next room. The next room reveal a panel showing 31 May 2010 and a wedding dress appears out of nowhere behind the panel. Shinichi notes it's the case where Kogoro screws up the wedding and the bride's friend gets murdered.
スナックでの窃盗事件の裁判で、被告側の証人として裁判に出席することになった英理。被告である麗香の証言は、犯行のあった時刻に英理が見知らぬ中年男とラブホテルから出てきたところを目撃したというものだった。裁判中、麗香に侮辱的な態度を取られた英理が指鉄砲で麗香を諌めるまねをしたとき、銃声が聞こえ麗香は頭を撃ち抜かれていた。入力したキーワードは「クチベニ」。
