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Basically on Jabberwock Island, Hajime has to go out for long periods of time, because there's alot of jobs that need to be filled, because alot of people are dead, and he has alot of Talents. Nagito doesn't like it because he's focusing more on the Untalented and not his own Lucky boyfriend, so he argues with him over it. Later Hajime decides that the most optimal solution is to chop of his own legs (his pain tolerance is high because of the experiments) and have Nagito have the choice to hold onto a wire that's connected to Hajime`s hands before he falls. He holds on, and the wire slices of Hajime`s hands and Nagito`s robot hand.
Nagito takes him and both his hands to a doctor (but he somehow forgets the pair of legs) and a week later he wakes up with the mentality of a horny child(?) and how Nagito has to take care of him because nobody cares about both of them now that they're useless.
I'm certain I could wrangle a metaphor from this about talentless and disability and how danganronpa society only values you if you have something to give and even then if youre the best at it so if you aren't the best or let alone need SUPPORT you get cut off and left to die and seen as a leech on your betters or ground into fuel for their success and Hajime who built his entire life on this, when he finally cuts himself off from it he becomes unable to function because he has no idea who he is or how to exist without it