Yu mercilessly stole his fame by taking down a villain in her debut and he was left in a slump as she was praised. Despite this, they were seen working together in U.S.J. Arc and stopped a villain and saving people.
Later on, they work together along with Death Arms as security guards during U.A.'s Sports Festival, where he questions whether she has any sense of shame or pride when she successfully uses her body to be able to acquire an order of takoyaki for free from a vendor.
After the Denki Kaminari vs. Ibara Shiozaki fight, Mount Lady teases that Kamui has a Quirk similar to Ibara Shiozaki's. At one point, she felt bad for stealing his glory though her tone implied she was being sarcastic.
During the raid on the League of Villains hideout, (in the anime) the two rode together in a car. Kamui Woods later rescued the unconscious Mt. Lady and tells her that she did well, showing he now respects and cares for her.
By the time of the Hero Billboard Chart JP, their close association led to rumors about them being romantically involved. Yu was speaking to reporters and told them that being on the same team as Kamui gave her a lot of encouragement which causes one of the reporters to ask if the reports of an alleged love affair were true. She smiles and declines to comment. 
Besides Kamui Woods, she is also seen associating with Death Arms. During U.A.'s Sports Festival, she was annoyed by his constant smoking while he was seen questioning if she has any sense of shame or pride when she successfully uses her body to be able to acquire an order of takoyaki for free from a vendor.
Yu does not appear to be on good terms with her, as they got into an argument after Mt. Lady made comments on her liking attention. This further escalated with Mt. Lady admitted to looking up but poked at her age, resulting in the two fighting in a televised interview.
- ↑ My Hero Academia Manga and Anime: Chapter 13 (p. 1-3) and Episode 9.
- ↑ My Hero Academia Anime: Episode 15.
- ↑ My Hero Academia Manga: Chapter 93.
- ↑ 4.0 4.1 My Hero Academia Manga: Chapter 184.
- ↑ My Hero Academia Manga and Anime: Chapter 34.5 and Episode 34.