Yn was a extra student of class 1a as he was framed by the league of villains as he was betrayed by his so called friends then his so called girlfriend jiro cheated on him with denki and expelled of ua then was being sent to tarturos till the truck that was taking Yn to tarturos was attacked by the league then kurogiri used his worpgate to send Yn somewhere else as Yn arrived on another world were there were heroes as well avengers,x men,guardians of the galaxy,fantastic four as Yn went to avengers tower and told him who he was and why he was sent here the avengers felt bad about Yn as they wanted Yn to stay and be an avenger which Yn accepted

Back at the mha world the league of villains reveal that Yn wasn't the traitor and now ua lost an innocent teen thanks to villains and to ua

Yn quirk
Sword breathing
Allows Yn to use elemental sword techniques against his opponents while using his breathing as a construct of his elemental powers

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Yn harem
Black widow

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Emma frost

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She hulk

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Rouge

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Maria hill

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Kitty pryde

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Black cat

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Who didn't believe Yn
Class 1a
Class 1b
Aizawa
Midnight
All might
The big 3
Yn ex parents and siblings

Who did believe Yn
Nezu
Recovery girl