Karushuu

Karushuu is the slash ship between Karma Akabane and Gakushū Asano from the Assassination Classroom fandom.

Canon
Gakushuu Asano made his debut in Assassination Classroom's Episode 15. As the highly-skilled school president, he stood right in the way of E-Class's ascension to top all 6 subjects for the end-of-term finals.

As Asano and Karma face off during the math exam they each watch at each other smugly; the latter notably lifts his chin at his opponent, a sign of superiority. Asano internally mentions his surprise at Karma being in the E-Class, and how his standing of 2nd overall place was quite impressive for a student like him. He goes on to monologue that he has no blind spots in any subject, and should be sure to win. Karma watches everyone fill out their math exam quickly and frantically with a smile. He and Asano are in the same scene in the 'gladiator fight' metaphor as the gate opens, and they both walk out into the rink with guns.

When the results are finally released, Asano managed to win two out of all five subjects being Math and Japanese- but lost English, Social Studies, and Science. Surprisingly, Karma doesn't manage to get anywhere near the leaderboard, as he places in 10th place for math, and 13th overall in the school.

Due to his leisurely arrogance, he cost the E-Class a tentacle because he thought he would be lucky and win again. Korosensei appears from behind him and reprimands him with his tentacles, saying that he didn't put in enough effort and should do better if he wants to succeed in the next test. The red-haired boy stalks off, embarrassed. At the same time, Asano is being admonished by his father for losing the bet between the A-Class and the E-Class, and both boys are shown with expressions of resentment and a strive to work harder.

After seeing the teaching methods of his father, Asano swallows his pride to bow down before the E-Class, asking them to kill his father's policies. He tells them to monopolize all the highest scores in the second-semester mid terms, with the exception of himself, who should be left for first place. He's then interrupted by Karma with a teasing/incredulous expression, who asks him if he should be worrying about others. Karma says that he is going to be the one to take first place; he then sticks his tongue out at Asano, and the latter looks down, aggravated.

Towards the end of the anime, in Episode 20, Karma says he is going to stay at Kunugigaoka Academy for his high school years. When asked by his friends why, he says that he wants to spend the rest of his three years rubbing it in the students' faces. He reminiscences for a moment, and tells them with a slight smile that only Kunugigaoka has an arch-nemesis who can keep up with him, and that it'd be fun to have a few academic battles before he goes off to college. He is obviously referencing Asano in this scene, because an image of the principal's son is shown, looking over a railing.

Moments

 * When Karma placed 2nd on one of the mid terms, he flaunts his score before the Five Virtuosos and Asano walks away with an irritated expression.
 * Asano admits in front of his father that the E-Class has grown as adversaries, and that he disagrees with Gakuho's violent way of teaching.
 * Karma suggests that Asano should be fine with 10th place, because he'll win first place instead.
 * The two are in the same scene while facing off against the last question of the math exam, which Karma narrowly wins by simplifying the equation.
 * In Koro-Sensei Q, Karma copies a sword that apparently only Asano can create, leading the two to glare at each other with threatening looks

Fanon
Karushuu is a decently well-liked ship in the fandom, but there are other popular ships that overshadow it; Karmagisa is alternatively the Assassination Classroom fandoms' most popular slash pairing. Contrarily, Asano doesn't have as many ships, because of he is more of a side character in the plot.

The two are usually regarded as adversaries because of their rivalry in the first season of the anime, where they were pitted against each other in the final exams for math. Their relationship was delved into further when Asano asked the E-Class for help, and Karma responds with his teasing remarks and complacent talk. It's a moment taken by fans who noticed the 'sexual tension' between the two in the scene.

Karma and Asano are both alike in terms of appearance and personality. They both have similar hair colors, with Karma's being red and Asano's being a reddish-orange. Both boys have a cunning and scheming personality and prideful outward appearance.

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Trivia

 * They share a zodiac sign, Capricorn.
 * Karma's birthday is on December 25th, making him a mere 7 days older than Asano, whose birthday is on January 1st.