Chapter 400

is the four hundredth chapter of Kohei Horikoshi's My Hero Academia.
==Summary==
After defeating Kunieda, Yuga looks toward Toru, surprisingly seeing her now partially visible. Realizing that she's exposed, she embarrassingly yells to look away, whining how being invisible was her whole identity, with Yuga apologizing, unsure how to react due to being on the verge of death. She thinks about how using her Quirk has never done this before, only to remember it happening the last time they fought, figuring that being on the edge of death made Yuga go past his usual capacity, which caused her Invisibility to glitch out.
She turns to Yuga, telling him his Quirk evolved, but he simply responds they need to burn away the plants to save the Heroes, since they would continue to grow even after their user was defeated. He tells Toru to adjust the strength of his light to burn the roots that dig into their flesh. She worries about his stomach, but he says today is his last day as a U.A. student, so he will do whatever it takes.
Meanwhile, the "Can't Stop Twinkling" laser beam begins to overheat, but All Might insists it keep shooting to keep All For One pinned down. Blasting just outside the laser's vicinity, he declares that he took inspiration from Star and Stripe's final battle, even if he wasn't able to turn the laser into solid matter like she did. All For One attempts to break free from the blast zone, but All Might retaliates with "Sound Wave Vibration: Earphone Jack", intending to keep him within the attack at all costs.
He recalls when the laser was shot he sacrificed the Tentacole to ensare All For One, using the Thrusters to fly away and the armor's "Invisible Girl" optic resin to shield him from the laser's heat. To plan the trap, he had to take the direct hit which he guarded with Tailman, however his legs still paid the price. He believes All For One wanted to see his face in pain so he didn't aim for the head, laughing how he got off easy.
All For One retaliates with a web of Rivet Stabs that slice apart more of the suit, so he unleashes the "Morphing Armor: Creati" and the "Binding Rounds: Grape Juice" in an attempt to lock him in place. All Might thinks about how he couldn't load himself up with more power than this, desperately hoping All For One finally fades away, while his euphoria is still overriding his pain. Elsewhere, a boy in another country is watching the battle on the television. He asks who the "skinny guy" is, and the old woman with him is unsure, not knowing much about Heroes. The boy asks what will happen if he wins or loses, but she simply says it's all happening in a far-off land, so whoever wins won't have much effect on them. Despite those words, the boy continues watching All Might, and holds his hands together in support.
The Can't Stop Twinkling beam finally overheats and is destroyed, and out from the now exposed crater, a glowing, child-sized All For One emerges, reminding All Might tools cannot surpass their limits. All Might is stunned by his appearance and charges toward him, as All For One's back begins to expand, asking if he's forgetting to smile. But suddenly, his body freezes in place, unable to move. Hovering above the battlefield, Stain appears, swallowing some of All For One's blood spilled on debris and using his Quirk, shouting for All Might to conquer him.
==Chapter Notes==
*Toru becomes partially visible as a result of the light of Yuga's evolved Navel Laser causing her Invisibility to glitch.
*All Might uses the remaining abilities in his suit to keep All For One pinned down in the laser at all costs.
*The laser overheats, revealing a now glowing, child-like All For One.
**Before he can attack, his body is frozen in place, as a result of Stain entering the battle, using his Quirk by swallowing some of his blood on debris.
==Characters In Order of Appearance==
*Yuga Aoyama
*Toru Hagakure
*Kunieda
*Fat Gum
*All Might
*All For One
*Star and Stripe 
*Stain
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