Representative director is typically required to become guarantor for office lease contract in Japan. Here is alternative way.

1. Using a guarantor service company ind of an insurance company). Recently, it is normal to use theses guarantor service companies instead of an individual guarantor in Japan for any lease of an office or a house. The range of payment for a premium is mainly 30%-80% of a monthly rent for only one time during the contract period (2 or 3 year). To get it, there is simple inspection needed by a guarantor service company. An real estate company, which is in charge of the lease contract for a landlord, mainly arrange and introduce an guarantor service company. 

2. Increasing the deposit for the rent If it is not possible to appoint a guarantor, a tenant can deposit more money in negotiation with a landlord. Depending on the deposit amount, a landlord can accept the lease contract without any guarantor.