Episode 37pic
Kid's Investigation Arc
Arc Info



Episode 37 - Episode 39

Arc Guide
"BREW" - The Tempest Arc
Arachnophobia vs DWMA Arc

Kid's Investigation Arc is the twelfth major story arc in the anime Soul Eater. Although it has similarities with the manga's story arc Internal Investigation, it differs in how it portrays Joe Buttataki's arrival to Death City, Franken Stein's madness from Marie Mjolnir's implanted snake, and Black☆Star's self-doubt following his defeat on Lost Island.

Featured Debut






The Detective's First Case – Kid Exposes the DWMA's Secret?

Main article: Episode 37 Arachne is convinced that BREW is defunct, when it is actually functional and in Medusa's hands.

Meanwhile, at the Death Weapon Meister Academy, those returning from Lost island are disappointed about their failure to retrieve BREW from Arachnophobia. Kid leaves class to investigate Eibon and Death's association, but his interrogation of Stein fails to provide clear answers.

At the Academy, Maka asks Death for information about her new Demon Hunter technique, and with his encouragement, she practices the technique throughou the day with Soul.

At the end of the day, a man named Joe Buttataki arrives at Death City at Death's request.

Asura's Temptation – The Big Man's Uncontainable Irritation?

Main article: Episode 38

Joe confirms with Death details for using demon tools to combat Arachnophobia, but the technician demands Death provide much better coffee from Uncle Bob's Rumba Coffee. Kid confronts this newly arrived Joe but cannot learn more about his goals with Eibon's demon tools.

Meanwhile, Black Star grows frustrated with Mira's warning not to use Tsubaki's Uncanny Sword Mode, as it reminds him of his own failings against Mifune and on Lost Island and perhaps of his own mortality. Therefore, he challenges Kid to a duel to prove that he can defeat a god. While Kid defeats Black Star, the ninja seems to regain his confidence to try harder and win his next battles.

Elsewhere, Arachnophobia prepares its plans to acquire Asura to unleash his madness globally.

Crona's Escape – Show Me Your Smile, Please?

Main article: Episode 39

Arachne locates Asura in an abandoned Buddhist temple in Tibet. While Asura attempts to choke her to death, she persists with a request that he join her.

At the Death Weapon Meister Academy's second campus, Maka and her friends enjoy a picnic prepared by Marie. But Maka notices Crona appears withdrawn. Meanwhile, Kid and the Thompsons attempt to follow Joe to learn what he is doing with the Demon Tools, but they cannot learn anything new.

Later, Spirit tells Maka that Crona has escaped the Academy. With Soul, she finds Crona hiding in the desert, blaming themselves for infecting Marie with Medusa's snake to augment Stein's madness. Maka forgives Crona and urges them to return to Shibusen. Before Death, Maka defends Crona when Death expels them for their betrayal, but this meeting is interrupted with shocking news: Medusa has come to the Academy to surrender herself.

The Cards Are Cut – Medusa Surrenders to the DWMA?

Main article: Episode 40

After surrendering to Shibusen, Medusa sits her in cell, confronted by Maka and Soul outside, the former demanding to know Crona's location and the latter telling the witch that she can rot away. After the students leave, Medusa explains to Stein (who is hiding next to the door) that won't be happening.

Bringing Medusa to the Death Room, Spirit and Death discuss her proposed truce. As she possesses Rachel Boyd's body, she knows that they will not harm Medusa without also harming the innocent child. She confirms that Sid managed to dig up BREW just where she said she had hidden it in the desert outside Death City, and that she has confidential information that Arachne has allied with Asura.

Medusa's information proves accurate: within minutes, Arachnophobia uses its Moral Manipulation Machine to release madness globally, worsening Stein's condition.

After returning Medusa to her cell, Death determines that she wants a huge battle between Shibusen and Arachnophobia, but he also knows that they must not allow Asura's madness to expand beyond his control. Therefore, Spirit returns to Medusa's cell to announce that her truce will be honored and that she is free to leave.

Upon learning of this truce, Maka and Kid are disgusted, as all students watch Medusa's smugly depart, even eyeing her terrified child Crona from afar.

Later, at Patchwork Lab, Marie returns home, only to find that Stein has been captured by Medusa.

Notable Instances

  • Death the Kid pursues an investigation into Eibon's association with Death, but his interview with Stein fails due to his continued suffering from madness. Joe's arrival to Death City only worsens Kid's distrust of Death, as no one will be honest with him why they are using Eibon's demon tools to construct weapons against Arachnophobia and their possession of BREW.
  • Black☆Star's frustration with his failure on Lost Island leads him to challenge Kid to a duel to prove to himself that he is still on the road to becoming a god. Scared for his friend's injured soul due to his use of the Uncanny Sword Mode, Kid is forced to knock out Black☆Star, handing Black☆Star another defeat. Black☆Star almost immediately recovers from his self-doubt after Kid beats him, but his desire to grow stronger, even through madness, persists up to his last fight against Mifune.

Differences from the Internal Investigation Arc and the Manga

  • The anime never reveals what Medusa was going to do with Crona upon the child's return to the mother.
  • By this chapter the anime had diverged widely from the manga. Whereas in this chapter Joe Buttataki's investigation into treachery within Shibusen leads him to suspect Stein, and to meet his death, in the corresponding episode Joe had only just arrived at the Academy, and his task was to create weapons from demon tools in the fight against Arachnophobia, not to investigate.
    • As the detective of the anime version of the Internal Investigation Arc, it is Death the Kid not Joe who is the investigator.
  • In the manga, Spirit Albarn and Sid Barrett arrest Franken Stein and instead of bringing him to Death takes Stein to Hook Cemetery to meet with Mira Naigus and Marie Mjolnir to see off him and Marie so they can clear Stein's name and find who really killed Joe Buttataki. In the anime, however, Spirit doesn't report Crona's disappearance to Death instead he informs his daughter and Soul about what had happened to Crona. This shows Spirit to be more cautious about reporting things to Death.
  • Whereas this arc refers to Marie and Joe as having dated, no mention of such a relationship exists in the anime.
  • However, the anime did give Joe a love interest: coffee. This arc does hint at Joe’s appreciation for a good cup of joe (perhaps related to his own name), yet the anime exaggerated his love for coffee whereas in the manga Joe simply dislikes the taste of what the Academy serves.
  • Whereas in the manga Black☆Star met with Naigus to receive the discouraging news about his health when using the Uncanny Sword, in Episode 38, this news was passed along to Tsubaki Nakatsukasa first, who then informed a truant Black☆Star.
  • As well, whereas in the manga Black☆Star challenges Kid to fight as soon as he exits the Dispensary, where Kid happened to be standing, in Episode 38 Black☆Star met with the main cast in the Class Crescent Moon, and it is at this point that he challenges Kid to fight.
  • According to the manga and this chapter, Maka had discovered Medusa's survival and Crona's treachery when she see's Eruka Frog speaking with Crona about Medusa's survival. While in Episode 39, Maka and Soul Evans learn about Crona's treachery when they confesses what had happened to Professor Stein in the desert pit. As well, Soul was not with Maka when Maka learns of Crona's treachery in this chapter.
  • Episode 38 concludes with Maka and Soul visiting Black☆Star in the infirmary to confirm his recovery, and Tsubaki meeting with Kid, as he repairs the Academy's spire, to apologize for Black☆Star's behavior. Neither event occurs in the manga: Maka retreats to her bedroom to ponder the news of Crona's treachery while Soul prepares a meal, and Tsubaki and Kid retreat into the background following Black☆Star's defeat.


  • In Episode 38, when arguing with Maka over her delay in entering to see Black☆Star, Soul's face resembles that of an anglerfish: his lower jaw extends forward with his usual sharp teeth.
  • In Episode 39, Marie Mjolnir's meal for her students includes hidden visual references to other characters: food is shaped like Excalibur, Lord Death's mask, and Soul Eater's EAT toothy badge, some snacks include Stein's stitches, and the packaging on the food and coffee features images of Excalibur and Ragnarok.
  • When Maka is about to punch Crona, it has a symbolic meaning: if Maka had punched Crona, it would have confirmed that they indeed could never trust anyone. However, when Maka refuses to punch Crona and instead hugs them, this shows that Crona can trust others.
  • In the English sub for the Japanese language, Maka compares her mother to a hippopotamus while in the English dub the anime is replaced with a grizzly bear.
  • In Episode 40, an animation error has Medusa's prison door misspelled as "Witch Medousa."
  • Episode 40 confirms that Free and the Mizune sisters are working as moles within Arachnophobia for Medusa in Chapter 30, whereas Episode 29 doesn't show them spying within Baba Yaga's Castle.


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