The title doesn't lie.
This is truly a story about an Innocent Sin. I cannot put into words how wonderful this story is. Although I have some nitpicks here and there, they don't make me any less marvelled by the story that this game portrays. The best part of all is that the bittersweet ending follows the theme perfectly. Those final conversations touched my soul.

"Listen to me... Anyone... has the power... to achieve their dreams... Don't worry... I'm sure... you can all..."