Reverse, Rewind

Tenko shot up, gasping and heaving air into his lungs. Where was he? The last thing he remembered was using his own quirk to- Oh, he felt the bile rising in his throat before he was rolling over, spewing his guts out onto whatever surface he was prone on.His body was sore and hurting all over, muscles screaming at him, bones creaking with unuse, bruises, cuts open and still bleeding. Taking a quick peek down at his body, the identifiable scarring of his Decay marring his own skin. How was he here? Where was here?Tenko was very aware that he should be dead, he shouldn’t be waking up at all. What was happening?OrIzuku Shimura, the worlds greatest villain has caused Hero society to be destroyed, everyone is dead. Tenko Shimura is the only one left, deciding to end it all, he somehow wakes up backwards in time. He has one mission, okay, maybe two; Stop his older brother from becoming a villain and see if he can save Shouto's brother along the way.