Ohio Rev. Code § 742.46
Except as provided in section 742.464 of the Revised Code, the granting of a benefit or pension to any person under sections 742.01 to 742.61 of the Revised Code, other than a person participating in the deferred retirement option plan established under section 742.43 of the Revised Code, vests a right in such person to obtain and receive the amount of such benefit or pension granted to the person subject to sections 742.01 to 742.61 of the Revised Code. Subject to sections 742.444 and 742.464 of the Revised Code, a person participating in the deferred retirement option plan vests in the right to obtain and receive the amount accrued to the benefit of the person when the person ceases participating in the plan.
Such right may be enforced by an action in mandamus instituted in the court of common pleas in the county in which the person granted such benefit or pension resides.
R.C. § 742.46