Supplement dated May 1, 2018
to the

The One Investor Annuity prospectus dated May 1, 2016

This supplement updates certain information contained in the prospectus. Please read it and keep it with the prospectus for future reference.

The following disclosures are added to the prospectus. These disclosures supersede any conflicting information presently included in the prospectus.

• Nationwide will not pay insurance proceeds directly to minors. Contact a legal advisor for options to facilitate the timely availability of monies intended for a minor’s benefit.

• Nationwide does not recommend or endorse any particular fund and it does not provide investment advice.

• Nationwide may substitute, eliminate, or combine shares of another underlying mutual fund for shares already purchased or to be purchased in the future if either: 1) shares of a current underlying mutual fund are no longer available for investment; or 2) further investment in an underlying mutual fund is inappropriate. Nationwide will not substitute shares of any underlying mutual fund in which the sub-accounts invest without any necessary prior approval of the appropriate state or federal regulatory authorities. All affected contract owners will be notified in the event there is a substitution, elimination, or combination of shares. The substitute underlying mutual fund may have different fees and expenses. Substitution may be made with respect to existing investments or the investment of future purchase payments, or both.

The following sections of the prospectus are restated.

1)	The Total Annual Mutual Fund Operating Expenses table, which shows the minimum and maximum total operating expenses, as of December 31, 2017, charged by the underlying mutual funds that a contract owner may periodically pay while the contract is in force. More detail concerning each mutual fund’s fees and expenses is contained in the mutual fund’s prospectus.
2)	The Legal Proceedings for Nationwide Life and Annuity Insurance Company and Nationwide Investment Services Corporation, which describe certain information about the legal and regulatory proceedings that the Company is subject to.
3)	The Underlying Mutual Fund Information appendix, which contains information about the mutual funds available to the contract owner through investment in the sub-accounts.

Total Annual Mutual Fund Operating Expenses
	Minimum	Maximum
Total Annual Mutual Fund Operating Expenses (expenses that are deducted from the mutual fund assets, including management fees, distribution (12b-1) fees, and other expenses)	0.50%	1.36%

Legal Proceedings

Nationwide Life and Annuity Insurance Company

Nationwide Financial Services, Inc. (NFS, or collectively with its subsidiaries, "the Company") was formed in November 1996. NFS is the holding company for Nationwide Life Insurance Company (NLIC), Nationwide Life and Annuity Insurance Company (NLAIC) and other companies that comprise the life insurance and retirement savings operations of the Nationwide group of companies (Nationwide). This group includes Nationwide Financial Network (NFN), an affiliated distribution network that markets directly to its customer base. NFS is incorporated in Delaware and maintains its principal executive offices in Columbus, Ohio.

The Company is subject to legal and regulatory proceedings in the ordinary course of its business. These include proceedings specific to the Company and proceedings generally applicable to business practices in the industries in which the Company operates. The outcomes of these proceedings cannot be predicted due to their complexity, scope, and many uncertainties. The Company believes, however, that based on currently known information, the ultimate outcome of all pending legal and regulatory proceedings is not likely to have a material adverse effect on the Company’s consolidated

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financial position. The Company maintains Professional Liability Insurance and Director and Officer Liability insurance policies that may cover losses for certain legal and regulatory proceedings. The Company will make adequate provision for any probable and reasonably estimable recoveries under such policies.

The various businesses conducted by the Company are subject to oversight by numerous federal and state regulatory entities, including but not limited to the Securities and Exchange Commission, the Financial Industry Regulatory Authority, the Department of Labor, the Internal Revenue Service, the Federal Reserve Bank and state insurance authorities. Such regulatory entities may, in the normal course, be engaged in general or targeted inquiries, examinations and investigations of the Company and/or its affiliates. With respect to all such scrutiny directed at the Company or their affiliates, the Company is cooperating with regulators. The Company will cooperate with its ultimate parent company, Nationwide Mutual Insurance Company (NMIC) insofar as any inquiry, examination or investigation encompasses NMIC’s operations. In addition, recent regulatory activity, including state and federal regulatory activity related to fiduciary standards, may impact the Company’s business and operations, and certain estimates and assumptions used by the Company in determining the amounts presented in the combined financial statements and accompanying notes. Actual results could differ significantly from those estimates and assumptions.

Nationwide Investment Services Corporation

The general distributor, NISC, is not engaged in any litigation that is likely to have a material adverse effect on its ability to perform its contract with the variable account.

Underlying Mutual Fund Information

This appendix contains information about the underlying mutual funds in which the Sub-Accounts invest. The underlying mutual funds in which the Sub-Accounts invest are designed primarily as investments for variable annuity contracts and variable life insurance policies issued by insurance companies. There is no guarantee that the investment objectives will be met. Refer to the prospectus for each underlying mutual fund for more detailed information.

Designations Key:

FF:

The underlying mutual fund primarily invests in other mutual funds. Therefore, a proportionate share of the fees and expenses of any acquired funds are indirectly borne by investors. As a result, investors in this Sub-Account may incur higher charges than if the assets were invested in an underlying mutual fund that does not invest in other mutual funds. Refer to the prospectus for this underlying mutual fund for more information.

Fidelity Variable Insurance Products Fund - VIP Equity-Income Portfolio: Initial Class

This underlying mutual fund is only available in contracts for which good order applications were received before September 1, 1999

Investment Advisor:	Fidelity Management & Research Company
Sub-advisor:	FMR Co., Inc., Fidelity Management & Research (U.K.) Inc., Fidelity Research & Analysis Company, Fidelity Investments Japan Limited, Fidelity International Investment Advisors, Fidelity International Investment Advisors (U.K.) Limited
Investment Objective:	Reasonable income.

Fidelity Variable Insurance Products Fund - VIP Overseas Portfolio: Initial Class

This underlying mutual fund is only available in contracts for which good order applications were received before September 1, 1999

Investment Advisor:	Fidelity Management & Research Company
Sub-advisor:	Fidelity Research & Analysis Company
Investment Objective:	Long-term capital growth.

JPMorgan Insurance Trust - JPMorgan Insurance Trust Core Bond Portfolio: Class 1

Investment Advisor:	J.P. Morgan Investment Management Inc.
Investment Objective:	Maximize total return by investing primarily in a diversified portfolio of intermediate and long-term debt securities.

JPMorgan Insurance Trust - JPMorgan Insurance Trust Mid Cap Value Portfolio: Class 1

Investment Advisor:	J.P. Morgan Investment Management Inc.
Investment Objective:	Capital appreciation with the secondary goal of achieving current income by investing primarily in equity securities.

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JPMorgan Insurance Trust - JPMorgan Insurance Trust U.S. Equity Portfolio: Class 1

Investment Advisor:	J.P. Morgan Investment Management Inc.
Investment Objective:	High total return from a portfolio of selected equity securities.

Nationwide Variable Insurance Trust - NVIT Cardinal(SM) Balanced Fund: Class II

Investment Advisor:	Nationwide Fund Advisors
Investment Objective:	The Fund seeks a high level of total return through investment in both equity and fixed income securities.

Designation: FF

Nationwide Variable Insurance Trust - NVIT Cardinal(SM) Capital Appreciation Fund: Class II

Investment Advisor:	Nationwide Fund Advisors
Investment Objective:	The Fund seeks growth of capital, but also seeks income consistent with a less aggressive level of risk as compared to other Cardinal Funds.

Designation: FF

Nationwide Variable Insurance Trust - NVIT Cardinal(SM) Moderately Aggressive Fund: Class II

Investment Advisor:	Nationwide Fund Advisors
Investment Objective:	The Fund seeks growth of capital, but also seeks income consistent with a moderately aggressive level of risk as compared to other Cardinal Funds.

Designation: FF

Nationwide Variable Insurance Trust - NVIT Cardinal(SM) Moderately Conservative Fund: Class II

Investment Advisor:	Nationwide Fund Advisors
Investment Objective:	The fund seeks a high level of total return consistent with a moderately conservative level of risk.

Designation: FF

Nationwide Variable Insurance Trust - NVIT Government Money Market Fund: Class I

Investment Advisor:	Nationwide Fund Advisors
Sub-advisor:	Federated Investment Management Company
Investment Objective:	The Fund seeks as high a level of current income as is consistent with preserving capital and maintaining liquidity.

Nationwide Variable Insurance Trust - NVIT International Equity Fund: Class II

Investment Advisor:	Nationwide Fund Advisors
Sub-advisor:	Lazard Asset Management LLC
Investment Objective:	The Fund seeks long-term capital growth by investing primarily in equity securities of companies in Europe, Australasia, the Far East and other regions, including developing countries.

Nationwide Variable Insurance Trust - NVIT Multi-Manager Mid Cap Growth Fund: Class II

Investment Advisor:	Nationwide Fund Advisors
Sub-advisor:	Neuberger Berman Investment Advisers LLC; Wells Capital Management, Inc.
Investment Objective:	The fund seeks long-term capital growth.

Nationwide Variable Insurance Trust - NVIT Multi-Manager Mid Cap Value Fund: Class II

Investment Advisor:	Nationwide Fund Advisors
Sub-advisor:	American Century Investment Management, Inc.; Thompson, Siegel & Walmsley LLC; WEDGE Capital Management L.L.P.
Investment Objective:	The fund seeks long-term capital appreciation.

Nationwide Variable Insurance Trust - NVIT Nationwide Fund: Class I

Investment Advisor:	Nationwide Fund Advisors
Sub-advisor:	AQR Capital Management, LLC
Investment Objective:	The Fund seeks total return through a flexible combination of capital appreciation and current income.

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Nationwide Variable Insurance Trust - NVIT S&P 500® Index Fund: Class II

Investment Advisor:	Nationwide Fund Advisors
Sub-advisor:	BlackRock Investment Management, LLC
Investment Objective:	Long-term capital appreciation.

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