May I deposit my luggage in airlines counter in Kunming, while going out of airport during transit?

I am Nepali passport holder and traveling from Kansai to Kathmandu through China eastern Airlines. I have long transit in Changshui Airport and planning to go out and stay in hotel. I came to know that we can get transit visa. I want to know whether can I deposit my luggage in the airlines counter before going out of airport, as my flight is on next day? If possible to deposit then where should I contact or what should I do for that, please kindly tell that