Ohio Rev. Code Ann. § 2152.03

When a child is arrested under any charge, complaint, affidavit, or indictment for a felony or a misdemeanor, proceedings regarding the child initially shall be in the juvenile court in accordance with this chapter. If the child is taken before a judge of a county court, a mayor, a judge of a municipal court, or a judge of a court of common pleas other than a juvenile court, the judge of the county court, mayor, judge of the municipal court, or judge of the court of common pleas shall transfer the case to the juvenile court, and, upon the transfer, the proceedings shall be in accordance with this chapter. Upon the transfer, all further proceedings under the charge, complaint, information, or indictment shall be discontinued in the court of the judge of the county court, mayor, municipal judge, or judge of the court of common pleas other than a juvenile court subject to section 2152.12 of the Revised Code. The case relating to the child then shall be within the exclusive jurisdiction of the juvenile court, subject to section 2152.12 of the Revised Code.