At the Urameshis' new apartment, Atsuko wakes up her son in tears. She's still devastated because of his recent death and resurrection, and is afraid he might fall asleep and never wake up.
Two boys walk towards Sarayashiki Jr. High School; one shows the other a dragon-carved fountain pen that was made especially for him. The other comments that if Yusuke were alive, he sure would want to steal that pen.
Yusuke comes from behind and greets them with a hug. Thinking he's a ghost, the boys run away. Yusuke is uneasy about it, but Keiko comes from behind and reminds him that most people don't know he's alive yet.
Yusuke remembers the kiss and feels uncomfortable next to Keiko, but all she does is to scold him for getting late to school. Yusuke bitterly realizes that nothing has changed between them.
At the school front yard, everyone is startled by Yusuke's return and start muttering amongst themselves. Keiko shrugs and says,"They never liked you very much before." Yusuke begins to regret having come back, until Kuwabara arrives with a smile and challenges Yusuke to a fight saying, "I'm gonna send you back to hell!" Okubo nudges him and says, "Hey Kuwabara, aren't you going to thank him for saving your cat?" Kuwabara shrugs him off, saying he will, but after he pounds Yusuke's face in.
Yusuke smiles. Now he's sure nothing has changed at all.Iwamoto watches Yusuke's return from a distance, and decides he's gonna find a way to expel the boy from school.
Yusuke skips gym class and goes to the roof. He finds a small lens in his pocket and remembers being given the magic object by Botan. She told him the lens is one of the seven objects a Spirit Detective can use in their work. It allows the user to see through walls, to find things that are hidden. He used it to look at Botan (probably through her kimono), and received an oar on his head for the perverted act Yusuke replied moodily that he wasn't interested in that Spirit Detective job, and Botan snorted: "Okay, so I'll just tell Koenma that he can take your soul away again." Clearly Yusuke has no choice in the matter.
Back to the present, Yusuke takes a nap on the roof. When he goes back to his classroom, his classmates are complaining that several objects have been stolen while they were in gym class - including the dragon-carved fountain pen. They all accuse Yusuke, the only one who wasn't in gym class. Keiko tries to defend him; Iwamoto comes in and asks what the trouble is.
In the teachers' office, Iwamoto socks Yusuke, refusing to listen to the boy's claim of innocence. Takenaka is less sure of Yusuke's guilt and asks Iwamoto if he has any proof. Iwamoto replied, "I pondered about it and concluded he's guilty. During all the time he's been away there was no stealing case in the school. His mother begged so he could resume his studies here."And then Iwamoto asked Yusuke if he inherited traits from his tramp mother.
Yusuke is furious: "I don't give a damn about what you say about me, but I won't stand you talking about my mother!" he prepares to punch Iwamoto, who is actually looking forward it; it's the perfect opportunity to expel him from school.
However, Koenma arrives just in time, paralyzing Iwamoto and Takenaka so they can't see him. He's frantic, and tells Yusuke that the three demons that stole the Spirit World Treasures have escaped to the living world.Koenma orders Yusuke to go after the thieves, but Yusuke argues that he has to solve his business first. Koenma tells him to use the psychic lens to see inside Iwamoto's pocket. The dragon-carved fountain pen and all the other objects are there.
Koenma "unparalyzes" the teachers, and Yusuke grabs the pen from Iwamoto's pocket, showing it to Takenaka. Iwamoto leaves the room, abashed and claiming it was Yusuke who put the objects in his pocket; Takenaka follows him, demanding an explanation.
Yusuke is still too angry to let go, so Koenma suggests that he take his revenge unnoticed by using his new power, the Spirit Gun: the energy of his aura being discharged in a powerful shot from his right index finger. With it he knocks Iwamoto down, without being noticed by either of the two teachers; but he's warned by Koenma that he can only shoot the Spirit Gun once a day.
Koenma describes the Spirit World Treasures: the Kouma Sword, which can turn humans into demons; the Forlorn Hope, which summons the energy of evil of full moon nights; and the Orb of Baast, which absorbs children's spirits. With these objects, the three thieves have the power to conquer the living world.
Yusuke sighs: "I have no choice. Now that I resurrected I have to work for the humanity's sake, right?" He patrols the streets, looking for the thieves. He's about to give up when he finds a small crowd surrounding a little kid who has passed out. Having some eerie feelings about it, Yusuke jostles the crowd and sees the kid's spirit leaving the body.
He remembers what Koenma told him about the Orb of Baast, so he follows the spirit by the streets to a dead-end alley full of mean-looking guys. Yusuke wonders which of them is the demon thief, until he "sees" five horns on one guy's head. Using the psychic lens, he sees the orb in the guy's pocket.
The other men pick a fight with Yusuke. He beats them up easily, but the demon thief took advantage of the distraction to disappear.
At Spirit Worldi, an ogre informs Koenma of the identities of the thieves: "Kurama, no criminal record, can change shapes, has supernatural agility;.Hiei, no previous crimes, unknown character,is a ruthless demon..Gouki, twelve crimes registered, huge supernatural power, eats human spirits, killed several chasers."
Botan barges in Koenma's office by walking through the wall, complaining that these three are too dangerous for Yusuke. Koenma says that his intention was preparing Yusuke gradually, starting with small cases, but now there's no time for smooth training; Yusuke has one week to retrieve the treasures before King Enma comes back from his trip. Koenma and Botan shiver at the idea of the dreadful things King Enma is likely to do in his anger, such as causing earthquakes in the living world or even erupting Mount Fuji. Botan decides to warn Yusuke about this deadline.
In the living world, Yusuke gets to a park. It's raining. At a distance, he sees a unnatual blue light.
Hiei is swinging the Kouma Sword, cutting tree trunks that are briefly turned into demons. He and Gouki make plans of using the treasures to take over the living world, but Kurama tell them he's leaving the group. Hiei is furious at his announcement Gouki demands that Kurama return the Forlorn Hope. Kurama: "I can't. I need this mirror for my own purposes." Gouki is about to punch Kurama to get the mirror when Yusuke arrives and introduces himself as a Spirit Detective, demanding the return of the treasures.
Kurama simply walks away: "I'm sorry, but I can't be captured yet." Hiei follows him: "Wait, Kurama, our talk is not over!" Yusuke is pissed with the two demons' "lack of manners", but Gouki stays to face him. He takes the kid's spirit from inside the orb and eats it.
Yusuke kicks his stomach, and Gouki coughs the spirit out. The spirit flies back to the kid and Yusuke thinks the problem is solved, but Gouki is on his feet again and turns into his true aspect: a muscular five-horned sharp-fanged brown-skinned demon.
Yusuke is in shock. Their fight starts and Gouki is clearly the stronger of the two, especially since Yusuke has already used his Spirit Gun today
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