Please refer to the following webpage.
When searching for a private apartment, you will need to understand common practices and systems that are specific to Japan such as key money (rei-kin), deposits (shiki-kin), and guarantor system. This Guidebook introduces tips for finding housing and information on Japan-specific customs and systems for private accommodations.
» "Basic Knowledge of House hunting" (Japanese / English)
» "Basic Knowledge of House hunting" (Japanese / Chinese)