Reiko Yanagi/Synopsis

U.A. Sports Festival Arc
Reiko finishes the Obstacle Race at 26th place. It is later revealed by Neito that she was a part of the group of Class 1-B students who went along with his plan to hold back in the Obstacle Race so that they could observe Class 1-A's Quirks and tendencies. She teams up with Itsuka Kendo, Kinoko Komori, and Setsuna Tokage for the Cavalry Battle, and doesn't object once Itsuka suggests for their team to allow Team Tetsutetsu to participate in the 1 vs. 1 battles in their place.

Forest Training Camp Arc
Reiko is seen with Yui Kodai, Kinoko, Pony Tsunotori and Setsuna when Classes A and B are heading out for the school trip. On the second day of the training camp, she listens along with the rest of her class as their homeroom teacher explains that they will be training their Quirks. During the aftermath of the Vanguard Action Squad Invasion, Reiko is one of the eleven students who received injuries of varying degree.

U.A. Cultural Festival Arc
Like the rest of her classmates, Reiko participates in the Cultural Festival by helping her friend Itsuka prepare for U.A.'s Beauty Pageant contest. When Neito Monoma, Tetsutetsu Tetsutetsu, and Yosetsu Awase barge in to check on Itsuka, Reiko tells them not to barge in so unexpectedly. Later on, Reiko presumably watches Itsuka perform in the Beauty Pageant during the Cultural Festival.

Joint Training Arc
Reiko, along with the rest of Class 1-B are pitted against Class 1-A as part of the Joint Training Exercise. She is placed in the fifth round of match-ups. As the matches go on, Reiko and her teammates watch Neito in exasperation as he shows further signs of insanity. While waiting for their upcoming match, Reiko notes that Izuku Midoriya could serve as a major threat to Team 5-B's victory, highlighting his newly-developed fighting technique. She then notes that Izuku could easily catch her team off-guard even by a second.

When their respective match starts, Class 1-B proceeds to initiate their plan of taking down Izuku Midoriya as top priority. As Ochaco Uraraka and Minoru Mineta attempt to catch their enemies off-guard, Reiko and her teammates (excluding Neito) use this opportunity to attack them with a combined attack. Reiko begins the attack by using her "Poltergeist" Quirk to send many flying objects straight at the opposing team. As Mina defends her team with her "Acid Veil" Super Move, Minoru notes that Reiko is aiming the objects at random targets as they don't seem to be homing in on their team. Upon scattering 1-A, Team 1-B vows to track down the remaining members in hopes of capturing them for a chance at victory.