Project Sento (ZZZ Harem X Male OC)

Tortured, experimented on, and now has been kept in stasis for 50 years since the tragedy... Now awoken, he had freed himself from imprisonment within the confines of the facility, making his escape with mysterious powers his body obtained during the experiments long ago.

Once a boy who managed to save the world with friends on his side, things were good at first. Until a series of events ultimately happened which led to him being forced to get experimented on, losing his friends one by one, and now being locked in stasis. Now he, was in an unfamiliar world where he had nowhere to go but to survive this new environment, surrounded by these strange creatures known as the Hollows, serving as a vigilant in Eridu.

Perhaps there is still hope, underneath the stoic demeanor of the boy is a sad one who had lost his loved ones in unseen circumstances and was left traumatized losing the last one of the group in the old world, what if a lot of girls would slowly integrate into his heart, helping him warm up?
Maybe there's a chance for the boy to find happiness even if he thinks he doesn't deserve any.

====Note====
Expect a lot of changes with the story itself.. (as it won't be completely following the main story, just thought it'd be nice to write some original stuff.)
I'll try my best to write this book even if I'll suck at some parts of writing.