Atomic Samurai and His Disciples

Atomic Samurai and His Disciples are a group of heroes who specialize in swordsmanship. The team consists of the S-Class hero Atomic Samurai and his A-Class disciples Iaian, Okamaitachi, and Bushidrill.

Overview
Atomic Samurai's disciples are all skillful swordsmen under the tutelage of the hero and rank just below Sweet Mask in the A-Class rankings. According to Fubuki, all of the disciples would be in S-Class if it weren't for Sweet Mask's gatekeeping.

Alien Conquerors Arc
Iaian accompanies Atomic Samurai to the Hero Association Headquarters in A-City, when the city is suddenly demolished by the Dark Matter Thieves. He manages to save a father and child from Melzargard. One of Melzargard's attacks tears Iaian's arm off. He is saved by his master and is ordered to stop bleeding. Iaian later observes the fight between Melzargard and the heroes Atomic Samurai, Bang, Puri-Puri Prisoner and Metal Bat. Seeing their attacks do nothing to Melzargard, Iaian tells them to retreat and find a solution to defeat it, but his pleas are ignored. After the monster is defeated, Atomic Samurai helps Iaian retreat to safety.

Super Fight Arc
Bushidrill, Okamaitachi, and Iaian discuss Garou's hero hunt as they await the end of the meeting of the the Council of Swordmasters. After Atomic Samurai kills the monsterized Haragiri, he declares that instead of focusing on Garou, the group will strike the Monster Association first.

Monster Association Arc
After the disciples enter the Monster Association HQ, they find themselves facing Do-S and her mind-controlled mercenaries. However, they are interrupted by Sweet Mask who tells them to leave Do-S and the mercenaries to him. Eventually, they decide to return and save the mercenaries from Sweet Mask, who was about to slaughter them. Do-S is later killed by the top-rank A-Class hero, they then separate and the three disciples are with the mercenaries.

Iaian, Okamaitachi, Bushidrill and the mercenaries soon encounter many monsters of the Monster Association. They proceed to dispatch those monsters together until a Demon-level threat, Devil Long Hair suddenly appears and the three disciples are separated from the mercenaries, leaving the three swordsmen to deal with the Demon-level threat on their own. They manage to defeat Devil Long Hair after having an intense battle against the monster.

The disciples later encounter a safe in which the Monster Association executive Evil Natural Water is kept in, but they are no match for the water based monster with their sword techniques.