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Toshiro has had an easy life. Things have always kind for just fallen into place for him. He lives with the constant nagging thought that someday, someone will realize he's just been coasting through life.
Hachi, a plain looking office woman, comes into his life as the series starts. At first everything seems fine. They hang out, have a little fun when they're alone together. She moves in pretty soon after they meet because of some issue with her apartment. They even get a cat, Momo.
But Hachi is not real. Hachi is a hallucinated personification of that nagging feeling in Toshiro's head. At the outset, she's only around in private times, and makes the occasional nagging comment. But as the series progresses, she shows up more and more, her criticisms get harsher and harsher. By the end of the series, she's appearing in full-schizo mode, clipping through furniture, her shouted derision is all Toshiro can hear.
And then, one day, it stops. Toshiro wakes up in a tranquil farmhouse, alone. He's leading a whole new life. While he was seeing these delusions, his body was on autopilot. He kept seeing his office, his boss, and his city life. But in reality, he left it all behind.
In S2, we rewatch the events of his life from the perspective of reality. But all of Toshiro's dialog is the same.