Under heavy rain, Gouki is beating Yusuke up. The boy is about to be strangled, when the demon hears voices and see flashlights approaching. Annoyed at the interruption, Gouki lets Yusuke go. The boy faints immediately.

He wakes up in his own bedroom. A worried Atsuko cries and slaps him hard, then cries some more. Confused, Yusuke wonders what happened, and whom the voices in the park belonged to. He instantly gets his answers when Atsuko points at Botan, saying she was the one who brought him home last night. The ferrygirl is wearing "normal" clothes, and Yusuke gasps when he realizes Atsuko can see her. Botan confidentially tells him that Koenma thought she wouldn't be able to work properly as an assistant Tantei if she remained invisible.

While Atsuko washes dishes in the kitchen, Botan reveals how she managed to locate him: with a magical compass that indicates the direction and distance to demonic energy sources.

Yusuke confesses he wasn't prepared to Gouki's full strength, and Botan warns him that the demon's two allies are equally strong, and that Yusuke has only one week to catch the thieves and retrieve the Treasures.

Koenma is watching this conversation through a videoscreen installed in his office. He's terrified at the thought of what his father will do to Ningenkai - and to him - if he finds out about the stealing.

Atsuko watches the news on TV: four little children went into coma without any medical explanation. Yusuke knows Gouki is behind this. Botan says the kids can survive without their spirits for about one day. Yusuke trembles, meditating that being trapped and devoured must be a fate even worse than being forced to drift around as he had before the resurrection.

But he's more confident now, knowing that his Reigan will work. Botan gives him the Reigekiringu, a ring that reinforces the Reigan's efficiency, but she warns him that his body will be very weak after he uses it. He nods, and checks the compass. When Atsuko brings the tea, both Yusuke and Botan are gone.

In a park, the Gaki Ball rolls towards a little girl. She gets the Ball and returns it to his owner, Gouki: "Thank you very much. To reward you, I'm gonna eat your spirit." The Ball sucks the girl's spirit and she falls, unconscious.

Yusuke arrives, promising to get even for the last night beat-up. Gouki summons his demonic aspect again; like this, his body is as hard as steel, nothing can cut through it. Yusuke learns this lesson the hard way when he tries to punch the demon. Whacking Gouki with a tree trunk proves to be equally useless, so Yusuke's only chance is the Reigan. But he remembers Botan telling him that she doubted the Reigan, even with the Reigekiringu, would be lethal against Gouki.

Yusuke is worried: "Even if I shoot in the eyes, I can only hit one of them... Wait! If I can shoot from a short distance..." His thoughts are interrupted when Gouki kicks him on the stomach. Botan interferes, attacking from behind. Gouki is unharmed, but promises to eat both Yusuke and Botan in a single mouthful.

Gouki grabs Yusuke's head and prepares to punch: "DIE!!!" But as he opens his mouth to yell this, Yusuke shoves a piece of wood inside, keeping the mouth from shutting. With the Reigekiringu, Yusuke shoots the Reigan inside Gouki's mouth. The demon falls and five spirits leave his stomach. Botan says all kids will be okay now.

In another part of the park, the little girl wakes up and cries for her mommy.

Yusuke holds the Gaki Ball and Gouki was defeated. But he remembers that there are still two Treasures to be retrieved.

It's night. Supporting himself on an improvised cane, Yusuke walks on the streets, refusing Botan's help. Suddenly, the compass begins to beep; Yusuke is worried because he's too weak to fight now.

Kurama appears: "You don't need to watch out for me. I won't fight and I won't flee. I'll just ask you one thing. Wait only three days more and I'll return the Mirror of Utter Darkness."

Back at the Urameshi's, Botan bandages Yusuke's wounds, claiming Kurama must be setting a trap: "That talk of his was too mushy. In three days we'll have a full moon. That's when the Mirror of Utter Darkness releases its greatest power. The Mirror reflects and grants the wish of the one who has it. However, for the wish to come true, you need to give something in return." The price for the wish is unknown.

Yusuke says he doesn't believe Kurama is a bad character. Botan reminds him that it was Kurama's friend who left Yusuke all bruised liked that, but the boy tells her about the argument he witnessed between the thieves: "I don't know why, but Kurama is going to part from the group."

Atsuko calls them for lunch, and Yusuke complains about the interruption. "What's the secret?" asks Atsuko, grabbing her son by the collar. "What're you hiding from me?" Yusuke doesn't tell her anything. Outside, Kurama is standing on the roof of a neighbor building, watching.

Another day. Botan tells Yusuke to go meet Kurama while she asks Koenma more info about the Mirror. Yusuke arrives at the meeting place, and he's surprised to find out it's a hospital. Kurama is waiting for him at the gate and leads him to one of the rooms where a woman is lying on the bed. Kurama calls her "Kaasan" and treats her very gently; Yusuke is flabbergasted.

The hospital roof, at sunset. Kurama tell Yusuke his story: "My name is Shuuichi, it's the name I use here in Ningenkai. That woman is my mother, who raised me. It's been long since my father died. I've been living here for fifteen years. My true body is the one of a fox. A very ancient fox achieved supernatural powers and became a demon. Picking on locks and decrypting secrets, it stole antique treasures. But fifteen years ago it was hit by a hunter. Taking a human form, I fled to this world. I was raised by a couple. I thought ten years would be enough to restore my powers, so I could leave."

Yusuke asks why he didn't leave yet. Kurama: "That lady... My mother has an incurable disease. Hiei and Gouki came to me during this anguished moment and invited me to steal the Reikai Treasures with them. I remembered the Mirror that grants all wishes. I want to save her using that Mirror. If it works, I'll surrender to King Enma's judgment." He adds that he wants to pay back for his mother's care during the past fifteen years.

Yusuke wonders why Kurama is telling him all that. Kurama: "I needed someone to listen to me, and you were the one who trusted me more." A nurse barges in, nervously calling Shuuichi. His mother's condition got worse abruptly, and the doctors are not optimistic.

Kurama goes back to the roof, determinate to use the Mirror. Yusuke asks him if he knows what the price is.

At Reikai, Koenma tells Botan that the price for having a wish granted by the Mirror of Utter Darkness is the life of the one who makes the wish. Botan flies back to Ningenkai to warn Yusuke.

On the hospital's roof, under the full moon, Kurama summons the Mirror's power. The Mirror asks if he wishes for his mother's happiness. Kurama agrees. Yusuke reminds him that to save his mother's life he'll have to give his own up. The Mirror makes a similar warning, but Kurama doesn't hesitate: "If she's gonna be saved, nothing else matters to me."

The Mirror starts to absorb Kurama's life. However, Yusuke offers part of his life to the Mirror, so Kurama won't die: "I don't want to see a mother suffering for the loss of her child again..." He remembers Atsuko crying at his funeral.

The Mirror casts out a huge explosion of light, knocking both boys out. Kurama wakes up, surprised to be alive, and runs to see his mother. Botan arrives and awakes Yusuke, and he shivers at the thought that he could have died again. "At times like this we don't even think about what we're doing." The Mirror has a last statement: "In consideration to your actions, the wish was granted and no life was taken."

The doctors tell Kurama that his mother is going to heal completely. Botan and Yusuke are happy, now that two of the Treasures were retrieved. But Koenma, watching from his office, is not so cheerful. "Yusuke doesn't realize how hard to retrieve the third object is going to be. Hiei, the owner of the Kouma sword, that one is very dangerous. It's gonna be tough."