The present invention addresses the problem of: providing a natural nail primer composition that has excellent adhesion to a natural nail and a gel nail and that forms a primer layer that can facilitate, by bringing into contact with a liquid and applying vibration thereto, the peeling (removal) of the gel nail from the natural nail; providing a natural nail primer composition containing (a)
cellulose nanofibers, (b) a water-
soluble polymer, and (c) a water-soluble
organic solvent; providing a method for peeling a nail from a natural nail by bringing at least a part of a nail formed by laminating, on the natural nail, a primer layer and one or more cured
coating film
layers, in this order, into contact with a liquid and applying vibration thereto; and providing a set comprising (i) the natural nail primer composition and at least one or more of (ii) a vibration generation device, a natural nail primer composition
drying device, a nail formation material, and a nail formation material
drying and curing device. As a solution, provided are: "a natural nail primer composition containing (a)
cellulose nanofibers, (b) a water-
soluble polymer, and (c) a water-soluble
organic solvent"; "a method for peeling a nail from a natural nail by bringing at least a part of a nail formed by laminating, on the natural nail, a primer layer and one or more cured
coating film
layers, in this order, into contact with a liquid and applying vibration thereto, the primer layer formed from the natural nail primer composition"; and "a set comprising the natural nail primer composition, and at least one or more of a vibration generation device, a natural nail primer composition
drying device, a nail formation material, and a nail formation material drying and curing device".