It's explained in the game actually.
"両親の仕事の都合で急遽引っ越しが決まり、ひとり暮らしを望んだ俺の意見は簡単に却下された。 "
"そして、海外よりは国内を選んだ…と、つまりそう言うわけだ。"
"My parents had to move right away because of their work, and they simply dismissed my opinion of wanting to live alone."
"And I choose to stay in the country rather than overseas... that's why."
Hence he went to live with her aunt (Akiko).
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