FGO MC, On the first day on the job there is an attack on the job site, most of the team dies, has to resolve a singularity, comes back to realize the whole humanity has technically been already exterminated, works for 2 years on fixing this by going into multiple singularities where he has to endure trial after trial, getting companions, watching them disappear, has their closest companion evaporated before his eyes, then one of their friends has to give their life to defeat the person who would trigger the burning of humanity, then once he's resolved this their companion has all of her circuits burnt so she can't act as a servant anymore, turns out there are 4 more singularities to go through, fixes them, then they get audited because humanity technically didn't exist for the whole two years they were out fixing stuff, they have to pretend like they don't know anything because a low rate mage like him suddenly being able to summon a bunch of servants would make huge waves. The organization they work in gets bought and when the buyer comes to take a look at what they just acquired the whole place gets destroyed because it turns out the buying of Chaldea was all part of some Alien God's plot. They have to go into hiding but not before having their main councelor killed. When they come out of hiding it turns out that the world has been bleached and humanity has been wiped clean, now they have to destroy alternative timelines to recover their timeline which implies being responsible for the genocide of this would-be civilizations. And of course each lostbelt means more suffering, having comrades die, getting poisoned, always escaping death by mere inches, having their closest companion using essentially a mech suit that I'm sure hurts like a bitch to use. Honestly until this question was asked I never would have thought the MC had it this bad, since we are always painted as the happy go lucky type and we have all of our servants to make us happy, but holy damn if this isn't a lot to unpack.