The present specification discloses a dry PRENCSO composition improved in storage stability, and a lachrymatory factor generating kit comprising the composition. The dry PRENCSO composition according to the present disclosure comprises PRENCSO and saccharide. The present disclosure also relates to a method for producing a dry PRENCSO composition, the method comprising drying a solution containing PRENCSO and saccharide. The present disclosure also relates to a lachrymatory factor generating kit comprising the dry PRENCSO composition, and a dry enzyme composition comprising alliinase and a lachrymatory factor synthase (LFS) and being dried. The present disclosure also relates to a method for generating a lachrymatory factor by contacting water with the dry PRENCSO composition and the dry enzyme composition.