Tetsutetsu Tetsutetsu & Itsuka Kendo vs. Mustard

Tetsutetsu Tetsutetsu & Itsuka Kendo vs. Mustard is a battle fought between U.A. students Tetsutetsu Tetsutetsu & Itsuka Kendo against the villain Mustard during the Vanguard Action Squad's Invasion of the training camp.

Prologue
At the start of the Vanguard Action Squad's invasion of the Beast's Forest, Mustard fills the forest with his toxic gas. This almost immediately incapacitates Juzo Honenuki along with several other students in the forest. Itsuka Kendo uses her Quirk to enlarge her hands grabs Yui Kodai with them in order to protect her.

Ibara is also knocked unconscious and Tetstetsu tries to carry her to safety. He receives gas masks from Momo Yoayorozu and eventually happens upon Itsuka and Yui. The girls equip the masks and Itsuka says they need to retreat back to camp. Tetsutetsu refuses and claims that he's going to fight back. Itsuka reminds her peer that Mandalay told all the students not to engage.

Tetsutetsu points out that Class 1-A has had chances to prove themselves because they've fought back against villains that attacked them. Refusing to run, Tetsutetsu tells Itsuka not to try and stop him because they're supposed to be heroes and it's a heroes duty to fight back against the criminals that threaten them.