Once there were the members of the basketball and volleyball clubs, a biker babe, a school idol, and their teacher going to class trip. However they ended up being trapped in Zoldyck family's estate. There they found a letter from Shao Kahn. It read "If Gon & co. can't open the testing gate for 5 days, Killua will meet with death."
Later, Osomatsu and his brothers, together with Jax, Sonya, Kitana, and Sub-Zero also arrive in Kukuroo Mountain, but little do they know that Goku Black declared that Gon & co. were murdered by the Zoldyck family thanks to the Colossal Titan. Can the sextuplets escape from Kukuroo Mountain alive along with the other survivors?