Kaoruko Awata/Synopsis

History
At some point, she joined Sir Nighteye's Hero Agency.

Shie Hassaikai Arc
Sir Nighteye begins to investigate a Yakuza organization known as Shie Hassaikai, after an incident involving the yakuza's run-in with with a gang of robbers known as Team Reservoir Dogs. However, the Police Force labelled it as an accident which the Nighteye Office found strange since it didn't make any sense and decided to investigate the Shie Hassaikai. A few days later, Bubble Girl reports to Sir Nighteye regarding the meeting between the Shie Hassaikai and the League of Villains that ends in a struggle between them.

Sir interrupts her and claims there is no room for a society without humor. Bubble Girl realize she fails to amuse Nighteye upon supplying him new information and asks him nervously to stop… At that moment, Izuku and Mirio arrive at Nighteye's office, only to find that Nighteye has placed Bubble Girl in a tickle device as punishment for her lack of humor in her report.

While Bubble Girl is released from the machine by Mirio, Nighteye challenges Deku to pass a test after failing to try to make him laugh if he wants to work in his agency. Nighteye orders Mirio and Bubble Girl to leave. After walking out, Bubble Girl asks Mirio if he needed a practical interview like Izuku, to which Mirio replies that Nighteye nominated him so he did not need one. Later Mirio and Bubble Girl renter the rooms, of which Sir Nighteye reveals he will take in Izuku.

Izuku is informed in the operation in which Nighteye is working, and the next day he goes on patrol with Mirio. Meanwhile, Bubble Girl accompanies Nighteye to watch the Shie Hassaikai Compound. After several minutes, Bubble Girl receives a call where Mirio tells them they made contact with Kai Chisaki, leader f the Yakuza. The four meet and Mirio and Deku tell them what happened and that Overrhaul has a daughter named Eri. For their part, Nighteye and Bubble Girl explain in more detail the reasons why they investigate Shie Hassaikai and his mysterious leader before return to the agency.

A few days later, at Sir Nighteye's Office, several heroes gather for a meeting about the Yakuza. The meeting begins with Bubble Girl explaining that the Heroes at Nighteye Office have been investigating the villain organization called the Shie Hassaikai. Centipeder explains that he made follow up investigations regarding the Shie Hassaikai and found out that they have been contacting other villainous groups and involvement with black market groups all over Japan; their motive for doing so is to increase their organization and finance. Soon after the official investigation began, the Shie Hassaikai made contact with a member of the League of Villains called Twice.

Centipeder and Bubble Girl continue with their explanation. Due to their investigation revealing these developments, Bubble Girl states that they requested their help through the Hero Network. As Centipeder tells her to skip that part, Sir Nighteye explains to his fellow heroes the situation. Shie Hassaikai has created a drug capable of eliminating Quirks, using the blood of a girl named Eri. For this reason, he has organized an operation with which to dismantle the criminal organization, arrest its members and rescue the girl.

During the following days, several heroes participates in the investigations to find out Eri's whereabouts, until Sir Nighteye discovers that she is in the Shie Hassaikai Compound. The heroes meet again at the Nighteye Agency, where they are informed of this discovery. Centipeder and Bubble Girl state that they have a time frame of when they will be home and they got a warrant from the police, so all they need to do is get in there.

The next morning at 8:00 AM, in front of the Police Station, Heroes partaking in the rescue operation have been given detailed information about the Shie Hassaikai's complex underground facility and and the Quirks of the people who are part of the organization. At 8:30 AM and the Heroes and Police Force are outside the Shie Hassaikai's Headquarters and commence the operation. Bubble Girl joins the heroes in their mission to arrest the Yakuza members and rescue Eri.

The Heroes reach a shrine with a vase on it; Sir Nighteye removes the vase and pushes on a wooden panel, which causes a secret door to open. Suddenly, three yakuza members of the Shie Hassaikai appear and prepare to attack. Bubble Girl uses her Bubble Quirk to generate bubbles that momentarily blind the Yakuza and subdues him with a hold, while Centipeder uses his supermove Centicoil to apprehend the other two. The rest of the Heroes go ahead while Nighteye's sidekicks restrain the yakuza. Neither of them can follow them underground because shortly after Mimic uses his Quirk to warping the walls and seal the entrance.

While their teammates fight in the underground labyrinth, Centipeder and Bubble Girl have defeated and rounded up the Yakuza in the upper level. One of the thugs mentions that the Heroes should have cooperated, to which Bubble Girl replies that he is crazy for thinking that, another thug responds that they are all quite sane and if they had cooperated with the Heroes, Overhaul would have killed them in an instant. Bubble Girl remarks that they are referring to Kai. One of the thugs mentions that Kai started using the name "Overhaul" after he fell and became like that. They state that their boss was once a noble Yakuza, looking for a way for the Yakuza to live in today's world and he resented the fact that the Shie Hassaikai have been designated as a villain organization rather than Yakuza.

They mention that they were all devoted to the boss, but their new boss who had given himself a villain name and started taking in actual villains into their group, fear that this may be the beginning of the end. Bubble Girl assumes that Kai is quite hated and asks if they didn't think he'd be caught, to which the thugs agree and mention that the ones who don't think about or care about the consequences are strong.

When all the members of the Shie Hassaikai are defeated, Centipeder and Bubble Girl as well as numerous police officers finally enter the underground, where they assist their allies. She later discovers that Sir Nighteye had been badly injured during his confrontation against Overhaul.

In the hospital they report her that the wound is so severe that Sir Nighteye only has a few hours to live. Because of this, Bubble Girl calls All Might to ask him to come visit his friend one last time, which he agrees to. Bubble Girl breaks down as Centipeder consoles her, while Nighteye says goodbye to his friends and allies until he finally succumbs to his wounds and dies.

Remedial Course Arc
With the beginning of October, Bubble Girl attends Nighteye's funeral along with Centipeder, Mirio, the Work-Studies group, All Might, Eraser Head and several other heroes who participated in the raid.

Due to what happened, they are informed that the Hero Work Studies program is postponed for the moment. Centipeder takes over Nighteye's Office, and he and Bubble Girl tell Mirio that he is welcome back anytime.

Endeavor Agency Arc
Due the increase of the villain activity, The Public Safety Commission demand all the students heroes for all academies to undergo practical field training, restarting the Hero Work-Studies program. With the program back in effect, Izuku phones to Bubble Girl and Centipeder about doing the Work-Studies in the agency, but they told him that it won't be possible because they have too much paperwork.