For your entire life, known as an abnormality of science, you’d been kept in an illegal lab. In due time, said lab had been raided by the government, freeing you.

An agent, you having piqued his interest, managed to gain a sort of permit over you.

And thus,

You were kept in a bathtub, of all things. Day and night, as Dazai tried to figure you out.

You stared mutely up at him as he tried to coerce you into eating sushi. —A correlation made because, quoted, “Fish eat fish!”