The Desperate Revival is a story-arc that appeared in both the manga and the anime. In the anime, the arc consisted of episodes 188-193. In the arc, it's apparent that Ran once again comes to the conclusion that Shinichi and Conan are the same person, and after Conan is shot by a group of thugs in a cave, he decides to tell her the truth. However, with the help of Heiji and Haibara, he is able to convince Ran that Conan and Shinichi are not the same. Plus, Haibara has created a prototype antidote for him, and he is now Shinichi! However, the antidote does not last long, and leads to heartbreaking results in the life of Shinichi and Ran.

The Cavern of the Detective Boys (Manga: 251-254, Anime: 188-189)

Situation
Ran is practicing for her princess role in a play that Sonoko wrote for their campus festival. Conan and her father object to who her partner is for the said play since she had to kiss someone. Just as Ran decides to take a quick shower for her practice, she is told that the shower is broken. Conan also wanted to take one so he asks Ran if she wants to go with him to Professor Agasa's house and take a shower there. When Ran comes over, Haibara goes to the basement for some important research and says she doesn't want to be bothered by anyone. Later, the Detective boys go to a camping site and find a limestone cavern. The gang decides to explore the cavern and Genta discovers a corpse and people disposing of it.

One culprit notices them so he shoots and seriously wounds Conan.

The Detective Boys search for an exit while running away from the culprit, and they managed to outrun them, but get trapped in a dead end passage. They hear from the murderers that there is one exit, but all the other passages in the cavern are dead ends. The branches are arranged in an unusual fashion and their is a strange pedestal with a round shaped stone on it. Conan passes out from his injury, but manages to relay a final hint to the detective boys on which passage to take.

The Wounded Great Detective (Manga: 254-255, Anime: 189-190)

Situation
As they rush the wounded Conan to the hospital, he is in need of a blood transfusion. Ran immediately offers her blood saying she has the same blood type as Conan does, and he thinks Ran already knows he is Shinichi.

Recovering in the hospital from his bullet wound, Conan contemplates telling Ran his true identity, since, Ran was already certain of who he was as she knew Conan's blood-type when she donated her blood, the same as Shinichi's. Additionally, Heiji and Kazuha drop by to visit him and Heiji warns him that it's best to be true, so he should tell Ran everything.

But Ai Haibara shows up and points a gun at him. She reveals that the Black Organization knew of her real identity and betrayal, but were willing to re-recruit her, as long as she kills Conan as well as the people who know who he is: his family, Agasa, Ran and Heiji.

The Third Choice and The Black Knight (Manga: 254-257, Anime: 190-191)

Situation
Later Ran is cast in a school play, while discussing the play with her friends, Conan shows up wearing a face mask due to a cold he had. Ran is supposed to play a beautiful princess who is rescued and protected by a mysterious Black Knight; Sonoko was originally cast as the Knight but has injured her arm so she cannot act, so Dr. Araide (who works as an aidé for a sports club in the school) is supposed to be the Knight now...

During the play Ran's "princess" is abducted by bandits (causing Kazuha, who is in the audience, to start screaming at them to leave her alone), but then she's saved by the Black Knight. Said knight has his face shrouded, so at first everyone thinks it's Araide, but the Black Knight appears to go off script embracing her and is about to kiss her, much to the horror of Kogoro... but the romantic scene is disrupted when a man in the audience falls dead, seemingly by potassium cyanide poisoning in a drink.

This last detail is revealed by a young man in the audience who seemingly turns out to be Shinichi Kudo, but is quickly revealed by Kazuha to be Heiji in disguise. After a series of questionings Heiji, although unsure of how the victim was poisoned was certain that the murderer was one of four prime suspects. The police are unable to find the source of the poison from the drinks. As they are able to rule the death as a suicide, the still masked "Black Knight" declares it was a murder...