"Cindersonic"

Sonic is living a great life until his father passes away. Sonic's mother remarried a "good" man with two wretched sons. One day Sonic's mother goes on a journey and never returned because of death. Sonic gets stuck living with his "family" until he rides in the woods and meets a princess. The Princess holds a ball expecting to see Sonic there. The stepfather admits his jealousy and locks up who he call Cindersonic in his attic room.