Ohio Rev. Code Ann. § 2305.02
The court of common pleas in the county where the underlying criminal action was initiated has exclusive, original jurisdiction to hear and determine a civil action or proceeding that is commenced by an individual who seeks a determination by that court that the individual satisfies divisions (A)(1) to (5) of section 2743.48 of the Revised Code. If that court enters the requested determination, it shall comply with division (B) of that section.