PE does require a lot of suspension of disbelief, particularly towards the end of some of the routes.
Winning the lottery in my opinion was actually a good move on the part of the writers. If Masaya didn't do something like than this plot thread would be hanging over the story like a bad smell, completely overshadowing every bit of drama together. Although it did end a little anti-climacticly it did do it's job and could've been a lot worse.