Letter of Guarantee

Does anyone know of an agency in Japan that offers a "Letter of Guarantee" to qualify for a business visa for Japan? Thank you.

hi, as per my best understanding,
Letter of guarantee is Given To individuals not for business.
similarly. letter of guarantee is Given BY individuals and not by a gurantor organization etc.

do u have some friend or relative in japan who will vouch for you ?
business is risk, so its individual risk of business manager, thats why it need 500 man as a capital investment.