No, Knock it Off, Ida! (だめだやめとけ (いい) () くん Dameda yame toke Īda-kun?) is the fifty-first chapter Kohei Horikoshi's My Hero Academia.

Summary

Izuku exits the train and starts running towards Hosu City to help Gran Torino against the Nomu-like creature.

Gran Torino had smashed the Nomu-like creature into a small building. The Nomu-like creature slashes at Gran Torino but the elderly Hero jumps out of the way in time, dodging its attack. Gran Torino sees that the Nomu-like creature is about to attack two civilians. Gran Torino jumps at the Nomu-like creature in order to save the civilians. However, the Nomu-like creature is scorched by flames, forcing Gran Torino to stop his attack and back away. Endeavor, the hero who scorched the creature, says that he hasn't made acquaintances with the elderly hero, telling Gran Torino that he will deal with the Nomu-like creature.

Izuku has arrived in Hosu and witnesses a battle between the pro heroes and two Nomu-like creatures. Izuku is surprised that Tenya isn't at the battle and starts pondering. Izuku quickly figures out that Tenya came to Hosu to find and hunt down Hero Killer Stain. Izuku leaves the battlefield and searches for Tenya.

On top of a building, Tomura praises the three Nomu for their destruction. Kurogiri asks Tomura if he will join the attack, however, Tomura replies that he won't because he is injured. Tomura says that when dawn breaks the world will forget about Stain.

The battle between Tenya and Stain begins; Tenya attacks Stain with a high speed kick, but the Hero Killer dodges Tenya's fast kick with ease by jumping above him. Stain kicks Tenya's right arm, causing it to bleed and slams Tenya onto the ground with his left foot. Stain stabs Tenya's left shoulder with his katana which defeats Tenya. Stain reveals to Tenya that he let Ingenium live in order to feed rumors. Stain says that both him and his brother are weak because they are fake heroes. Tenya, even though he is defeated, rebukes Stain's claim that his older brother Tensei is weak, yelling that Tensei was a splendid Hero and that he will kill Stain to avenge his older brother. Stain tells Tenya to save the injured pro hero behind him, surprising Tenya. Stain preaches to Tenya that he must act selflessly by rescuing others first and not be selfish by brandishing his power for his own sake. Stain states that seeking revenge just to satisfy one's selfish desires is the act furthest from the title of "hero" which is why he will die now. Stain stomps his foot on Tenya's head and prepares to kill Tenya with his katana, saying that Tenya will be an offering to a just world. Tenya refuses to listen to Stain's preaching, yelling that Stain is just criminal scum who hurt his older brother.

Stain is about to deliver the finishing blow. However, Izuku suddenly appears, having activated One For All throughout his body and punches Stain in the face with his enhanced might, preventing the Hero Killer from finishing off Tenya. Izuku announces his arrival and declares that he came to save Tenya.

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Chapters and Volumes
Volume 1 1234567
Volume 2 891011121314151617
Volume 3 181920212223242526
Volume 4 272829303132333435
Volume 5 363738394041424344
Volume 6 454647484950515253
Volume 7 545556575859606162
Volume 8 636465666768697071
Volume 9 727374757677787980
Volume 10 818283848586878889Tsuyu's Ribbity Day
Volume 11 90919293949596979899
Volume 12 100101102103104105106107108
Volume 13 109110111112113114115116117118
Volume 14 119120121122123124125126127128
Volume 15 129130131132133134135136137
Volume 16 138139140141142143144145146147
Volume 17 148149150151152153154155156157
Volume 18 158159160161162163164165166167
Volume 19 168169170171172173174175176177
Volume 20 178179180181182183184185186187188
Volume 21 189190191192193194195196197198199200
Volume 22 201202203204205206207208209210211212
Volume 23 213214215216217218219220221222223224
Volume 24 225226227228219220221222223224235
Volume 25 236237238239240241242243244245246
Volume 26 247248249250251252253254255256257258
Volume 27 259260261262263264265266267
Volume 28 268269270271272273274275276
Volume 29 277278279280281282283284285
Chapters not yet in tankōbon format 286287288289290291292293294295296297298299300301302303
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