Fate-Choosing Sequence

Both parents dead, with a car and a house, and an adorable but rather useless little sister...

This should have been a dreamlike, happy life, so why did things turn out like this?

After being released from a dazed existence in prison for more than ten years, how can I live a peaceful life in this seemingly familiar world that has changed beyond recognition?

P.S. The protagonist's gender doesn't matter. That's the key point.

P.P.S. No White Album 2-style emotional trauma or stomach medicine (seriously).