It varies according to the hotel. Below is the list of possible places to store luggage.

Possible to store Luggage	HOTEL GRAN Ms KYOTO HOTEL M’s PLUS SHIJO-OMIYA HOTEL M’s EST SHIJO-KARASUMA HOTEL The M’s KYOTO HOTEL M’s EST NANAJO HOTEL Pagong with M’s HOTEL M’s EST KYOTO STATION SOUTH
Luggage is not possible to store	M’s HOTEL SANJO OMIYA M’s HOTEL NIJOJO OIKE M’s HOTEL NIJO M’s HOTEL SANO WAKOKU M’s HOTEL GOJO ODAWARA M’s HOTEL GOJO NAGINATAGIRI M’s HOTEL KYOTO STATION KASUGA M’s HOTEL KYOTO STATION TARUYA M’s HOTEL KYOTO STATION KIZUYA M’s INN HIGASHIYAMA