A Room Without Window
Em what the sigma Ch 6 Zombie kinda creature out broke 9 years ago. The mcs memory only exists from before that To him, he's held hostage by a weird man his age, in the same room, the food is bland and no one has come to get him. Despite 9 years passing he lives like it happend yesterday unaware of how long it had been. The guy takes care of him as if he's the most precious thing in the world. MC allows him to sleep with him, in order to steal his hairpin to escape out the locked door. Yet when the moment comes he pulls it off effortlessly, a skill he never thought he knew. The door pulls back to a futuristic bunker looking hall, 'B6' its labeled, and he goes up. Outside only to meet the faces of the zombies. These weird memories come back and the betrayal of his friends, the rotten foot, his lover abandoning him so he could be eaten. All of it. He's staring at them outside in the cold, with no protection. The man returns and he's under the covers crying, he realises his memories are back and in a morbid sense asks him to survive with him. In this 80year capped bunker. It's weird but it's actually really good high-key
Unmei no Tsugai ga Omae da Nante