No Shoulder: Beware Falling Off Cliffs into Alternate Dimensions

After losing both of his eyes and jumping off a cliff, Uchiha Shisui had thought that was the end.
What he hadn’t been expecting was to wash up on the shore of some hero training facility in a different dimension, get found by Hatake Kakashi—now Shinsou Hitoshi, apparently—get questioned extensively by Hitoshi’s new dad and a truth-seeking police officer, adopted by a gun-slinging cowboy, and then forced to attend a hero school where people are a lot weirder and a lot more gullible than he would’ve thought they’d be.
But for the record, it’s not Shisui’s fault the kid believed him when he said his quirk was mangoes.