To apply for a Japanese visa on Ctrip, do I have to book air tickets and hotels on Ctrip?

No. Japan has an individual tourist visa. Hotel and air ticket orders can be provided, just find a travel agency or agent to place the order. The rest should be prepared in accordance with the requirements of the embassy, ??such as proof of family relationship, employment status

, proof of assets, etc.

Japan pays more attention to the convenience of funds. It's ok if the funds are OK.