No, Sebastian does not eat Ciel's soul in Season 1.
At the climax of Season 1, a pivotal moment occurs where Sebastian attempts to consume Ciel's soul, which would have resulted in Ciel's death. This highly anticipated act is the culmination of their demonic contract. However, the exact outcome you might expect from such a contract is dramatically altered at the last minute.
What Happened Instead?
Despite Sebastian's readiness and Ciel's soul being within his grasp, a crucial intervention prevents the consumption:
- Sebastian's Attempt: Sebastian was indeed poised to finally claim Ciel's soul, bringing their agreement to its ultimate conclusion.
- Claude Faustus's Intervention: Before Sebastian could successfully devour the soul, Claude Faustus, the demon butler serving Alois Trancy, interceded. Claude was able to snatch Ciel's soul away, demonstrating a surprising speed and strategic maneuver that caught Sebastian off guard.
- The Aftermath: This unexpected turn of events ensures that Ciel's soul remains intact at the end of Season 1, setting the stage for subsequent developments in the series.
This twist profoundly impacts the continuation of the story, as it leaves the central contract unfulfilled and opens new avenues for the characters' journeys in later seasons. The dramatic near-consumption highlights the constant threats and intricate power dynamics within the demonic world of the series.