Kazuho Haneyama/Synopsis

History
When she was younger, Kazuho tried to leap across a river but the ground was wet from rain, so she slipped and fell into the river. On his way to take his hero-course entrance exam, Koichi pulled her out of the water and gave her his silver age All Might hoodie.

Naruhata Vigilantes
Several years later, Kazuho reencounter Koichi while performing his street performances as Pop☆Step. Koichi notes that Pop☆Step is taking a big risk in being a freelance idol since she does not have a permit. A police vehicle is passing by, so Koichi warns Pop☆Step, who decides to end her live performance and flies away.

Later that night, while Koichi was returning home after an incident at work, he meets Kazuho again in an alley. She thanks him for helping her that morning but she make fun of him for being weak and wearing an All Might hoodie, which causes both to start arguing. Pop☆Step begins to leave but bumps into Soga and his friends. The thugs recognize her as the online idol, begin mocking her and even thinking to sexually assault her.

Scared, at first Koichi thinks about leaving her to her fate, but seeing her scared face decides to help her without thinking. He does not have much success at first, and all he gets is to anger even more Soga, but with the sudden appearance of Knuckleduster, between both defeat the thugs and save Kazuho.

After this meeting with Knuckleduster, Koichi becomes his pupil, and the three form the group that would become known not much later as the "Naruhata Watchers". Knuckleduster explains to both of them the personal mission in which he is involved: he is trying to dismantle the illegal traffic of a drug known as Trigger, which boost an individual's Quirk, simultaneously weakening their sense of reason.

Although Kazuho does not usually fight directly against the villains, he helps Koichi and Knuckledusters in their patrols, investigating for them, helping to evacuate the passers-by, providing first aid, etc... While continuing performing as street Idol. This makes him get involved in several problems, but also allows him to meet many other people who help him to ascend in the world of entertainment.

One of these people is Makoto Tsukauchi, a senior college student from the same university as Koichi.

Marukane music concert
When Kazuho Haneyama received an email request from her blog that asks her to join a live event on the roof of the Marukane Department Store, she fears that since people view her as a singing street performer and if she screws up they would desert her, yet this is a chance that does not appear often. To help her, Koichi brings Makoto to help with the situation at hand. Kazuho gets mad at Koichi for her knowing her secret identity, to which he replied Makoto has sharp intuition. Makoto promises to Kazuho that she would not mention her masked escapade to anyone.

Kazuho ends up being part of Feather Hats, a musical group composed by her; Feathers, an underground idol duo conformerd by the twins Miu and Yu, the band the Mad Hatters and East Naruhata High Dance Squad; and thanks to Makoto's business skills and contacts, She gets sponsors for Narufest.

The night of the premiere, in the greenroom, Kazuho Haneyama begins to feel nervous about going out on stage. However, a villain causes a blackout and everyone is worry that the show is called off, and Pop☆Step  notices that Koichi Haimawari has gone off somewhere. Koichi emerges from the crowd as The Crawler. He gives Pop her microphone. Pop agrees with the plan for her to go on stage and keep the audience calm.

Pop☆Step explains to the crowd why the power went out, and that the staff are working hard to restore it. She then introduces herself to the audience. Pop instructs those with glow-sticks and assorted light-up goods to line up at the edge of the crowd, and for the rest of the audience to move a bit towards the stage to make a path. She tells the gathering of people that they have time to go to the bathroom before the main event, and that in the mean time she will perform a few songs. Miu & Yu note that she did some slick work on the stage. They also mention that she was as lame as ever, but kind of cute.

When the power is restored. Pop☆Step tells the crowd that the show will begin. The Feather Hats perform their remix of the Marukane Department Store Jingle, and they are greeted with great applause and cheering from the crowd.(25), thats goes wild after the Feather Hats finish their performance.