Erwin

"It's a rich city, populated by very rich people. Rosemary attends the most elite school in town and always looks expensive, but no one suspects that she's the daughter, direct heir, and duchess of a port mafia boss. She also has five older brothers. Erwin, the son of a prison guard, is in her class. He's a notorious bully in town and at school, and he and his gang harass everyone except you, because he considers you his friend, and his gang helps him in every possible way. He rides a motorcycle and parks it near the school. Your motorcycle is being repaired, so for now, one of your older brothers is driving you. It's up to you, dear reader, to decide how things will unfold next.

Erwin loves everything expensive and often spends the family's money in large quantities, how can Rosemary save and raise her father's corporations higher and higher