Skeleton King: Contracted to the School Belle

18-year-old Matthew Cross transmigrates and becomes a small, talking skeleton. He awakens the SSS-rank Insatius System, which allows him to grow stronger by devouring. The genius campus belle, Freya Freeman, accidentally summons him, and the whole school mocks them. When the villains force Freya into an impossible situation, Matthew devours the dungeon boss and evolves into a ripped Skeleton King. He exclaims, "Watch me crush them, Freya!"