With the release of My Hero Academia: Vigilantes episode 7, the anime introduced fans to Makoto Tsukauchi, Detective Naomasa Tsukauchi's younger sister. She was writing a thesis on vigilantes, so she decided to help Koichi with her studies in exchange for his help investigating the Naruhata vigilantes.
The anime's previous episode focused on Stendhal, who was pursuing Soga Kugizaki when Koichi came to his rescue. However, just as Stendhal incapacitated Koichi, Knuckleduster came to his rescue. While Knuckleduster defeated the vigilante, his words inspired him to turn into Hero Killer: Stain.
My Hero Academia: Vigilantes episode 7— Makoto fails to identify Koichi's secret identity

My Hero Academia: Vigilantes episode 7, titled Makoto/Truth, opened with Koichi Haimawari preparing for a test on "Intro to Hero Sociology." Noticing his struggle, a senior named Makoto approached him, willing to share her insights and notes. However, she also needed his help, particularly concerning knowledge of the Naruhata region.
The episode then showed Makoto joining Koichi at his place. While Kazuho was there, she concealed herself to avoid an awkward meeting. Shortly after, Makoto began tutoring Koichi on the origins of heroes and what set them apart from villains. After giving Koichi pointers on what he needed to focus on, Makoto revealed what she wanted from him.

Makoto was seemingly doing a thesis on the Naruhata vigilantes and how the general public perceived them. For this research, she wanted Koichi's help to guide her through the region. To that end, Makoto scheduled a meeting with Koichi in front of the Naruhata railway station. After Makoto left Koichi's home, Kazuho revealed to Koichi that she had been at his place from the start.
Moments later, the anime revealed that Makoto was Naomasa Tsukauchi's younger sister. She hoped to gather some intel from her detective brother. However, Naomasa remained tight-lipped and asked his sister to stay safe.

My Hero Academia: Vigilantes episode 7 then switched to Koichi Haimawari and Knuckleduster's training session, where the Crawler showcased his newly created moves to his mentor. While Knuckleduster was impressed, Kazuho thought he was being lame. Later, Koichi informed his mentor about helping Makoto with the vigilante investigation.
The anime then shifted to the meeting between Koichi and Makoto at the front of the railway station. The two began interviewing the general public to learn their opinions about the Naruhata vigilantes. The words most commonly associated with Pop were "cute" and "butt."
As for Grandpa Fist (Knuckleduster), they included "don't know," "scary," and "dangerous." Lastly, for the Cruller (The Crawler), the responses were "gross," "useful but gross," "seems nice, but still gross," and "weird and gross."

Just as Makoto started analyzing them, a thief named Emperor Yotsura stole her laptop. In response, Koichi quickly changed into his vigilante costume and went after the thief. While Koichi couldn't stop him on his own, he retrieved the laptop with help from Ichimoku Samazu and Juubee Namimaru.
My Hero Academia: Vigilantes episode 7 then showed Makoto and Koichi going their separate ways. But before that, Makoto shook Koichi's hand. It was revealed that Makoto possessed the "Polygraph" Quirk, which allowed her to find out if someone was telling the truth.
While activating the Quirk, Makoto asked Koichi if he was the "Cruller." Given the technicality of the incorrect name, Koichi got away by saying he wasn't the vigilante. The anime episode concluded with Makoto writing a thesis and Koichi and Pop reviewing it later.
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