Bittersweet Fate

Kaito Kisiragi is a man who has seen and experienced things that a young man shouldn't during childhood. He's seen murder and lived through madness.
His caregiver, Melinda Murry, a woman with a sadistic mind and a taste for torture, isolates him from the world in a solid, concrete, dark room, behind bars, with many devices of torture awaiting him everyday.
When he is finally free from her clutches, he begins to see the world different from how he saw it when he was younger. He begins to see that the world is not as cruel as he thought.
Or is it...