Soudanidai

Soudanidai is the slash ship between Kazuichi Soda and Nekomaru Nidai from the Danganronpa fandom.

Canon
Kazuichi and Nekomaru interact a fair bit in Danganronpa 2: Goodbye Despair, especially during the second and fourth chapters.

In Chapter 1, after gathering at the hotel restaurant, the Ultimate Imposter questions Hajime Hinata about the whereabouts of Kazuichi. Hajime tells everyone that Kazuichi had ran away, and Nekomaru expresses consideration for his behavior, stating that it is understandable after what they had all witnessed the previous day.

In Chapter 2, Nagito Komaeda is noticeably absent from the group meeting, and Nekomaru dubiously states that he doesn't know anything about his disappearance. Kazuichi adds on, saying that Nekomaru is right, and that they should all just forget about Nagito. Chiaki Nanami points out that the two of them are acting suspicious, which they stutteringly deny. The following day, after convening at the restaurant once again, Nekomaru accidentally reveals that he had tied up Nagito, before frantically asking Kazuichi what they should do. Kazuichi angrily tells him not to rope him in, but slips up and reveals his involvement as well. The two then justify their actions by stating that Nagito tried to put them all in danger, and so it was necessary to prevent him from roaming around of his own free will. Most of the group consents to this decision. Later on, when Monokuma presents a game called Twilight Syndrome Murder Case as the students' next motive, Kazuichi suggests that they'll be okay as long as nobody plays it, and Nekomaru laughs while calling him a genius.

The two rarely speak to each other since then. However, in Chapter 3, after Nekomaru sacrifices himself to save Akane Owari from Monokuma, Kazuichi was the first to scream in panic, fearing that he had been killed. After it was discovered that his heart was still beating, Nekomaru was quickly rushed to the hospital on the third island. Kazuichi then asks if Nekomaru is going to be okay, hoping for a reassuring answer.

Nekomaru is later revealed to have survived his injuries, and in Chapter 4, the group reacts in shock upon seeing that he had been revived as a robot. Kazuichi is apparently unconvinced, and attempts to tear off Nekomaru's face, believing it is only a mask. After the authenticity of the situation settles in, Kazuichi's horror quickly turns to amazement at the technology. Kazuichi asks Nekomaru if he can dissemble him and take a look at his insides, which Nekomaru declines, as doing so will kill him. The following morning, Kazuichi continues to be astonished by Nekomaru's new form, and shows excitement whenever Nekomaru discovers a new function, often hoping it will be the ability to fly. While the group is exploring the fourth island, they are told that they will all receive a prize if they ride the roller coaster together. However, Kazuichi refuses, leading to Nekomaru having to using force.

In Chapter 5, following Nekomaru's death as a robot, Kazuichi salvaged some of his leftover parts to create Minimaru, to help cheer up Akane and the other remaining students.

Quotes
"Gahaha! That's absolutely right! You're quite the genius!"

- Nekomaru praising Kazuichi's intellect.

"Hey...he's gonna be all right, right? Nekomaru's...gonna be saved, right?"

- Kazuichi showing concern for Nekomaru's well-being.

"A-Awesome... He's seriously a real robot! Hey, can you let me disassemble you!? Can you let me disassemble you and show me your insides!?"

- Kazuichi astonished by Nekomaru's new robotic body.

Fanon
The ship mainly sailed after the two worked together to restrain Nagito in the second chapter. It was further fueled by Kazuichi's fascination with Nekomaru's robotic body in Chapter 4. Many fans were also moved by Kazuichi's Minimaru creation.

While the ship isn't overly popular in the fandom, it still does have a small and dedicated following, and a decent number of fan content. It is among the more popular shipping choices for Nekomaru, while on Kazuichi's side, it tends to be overshadowed by Kuzusouda, Soudam and Sounia.

Fandom
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Trivia

 * Both characters are blood type A.
 * Both are depicted wearing blue and white attire throughout Despair Arc, and are among the only students in Class 77-B who don't wear the school uniforms.