WE CLAIM:
1. An ink set, comprising:
a colored ink including an organic solvent A1, a polymer C1 that does not have a polymerizable group, and a colorant, the colored ink including the organic solvent A1 at a content of 30% by mass or more with respect to the total amount of the colored ink; and
a clear ink including an organic solvent A2 and a bifunctional or higher-functional (meth)acrylate compound X2 having a weight average molecular weight of 1,000 to 30,000, the clear ink including the organic solvent A2 at a content of 30% by mass or more with respect to the total amount of the clear ink and including the (meth)acrylate compound X2 at a content of 5% by mass or more with respect to the total amount of the clear ink,
wherein the solubility at 25°C of the polymer C1 in the organic solvent A2 is 10% by mass or higher.
2. The ink set according to claim 1, wherein the colored ink further includes a bifunctional or higher-functional (meth)acrylate compound X1 having a weight average molecular weight of 1,000 to 30,000.
3. The ink set according to claim 2, wherein the content of the (meth)acrylate compound X2 in the clear ink is larger than the content of the (meth)acrylate compound X1 in the colored ink, and the average number of functional groups of the (meth)acrylate compound X2 in the clear ink is larger than the average number of functional groups of the (meth)acrylate compound X1 in the colored ink.
4. The ink set according to claim 2 or 3, wherein the content of the (meth)acrylate compound X1 with respect to the total amount of the colored ink is 1% by mass or more.
5. The ink set according to any one of claims 2 to 4, wherein in the colored ink, the content of the polymer C1 with respect to the total amount of the polymer C1 and the (meth)acrylate compound X1 is 15% by mass to 50% by mass.
6. The ink set according to any one of claims 1 to 5, wherein the content of the polymer C1

in the colored ink is 1% by mass to 10% by mass with respect to the total amount of the colored ink.
7. The ink set according to any one of claims 1 to 6, wherein the weight average molecular weight of the polymer C1 is 3,000 to 200,000.
8. The ink set according to any one of claims 1 to 7, wherein the polymer C1 is a vinyl chloride-based resin.
9. The ink set according to any one of claims 1 to 8, wherein the clear ink further includes a (meth)acrylic-modified polyorganosiloxane.

10. The ink set according to any one of claims 1 to 9, wherein the colored ink is a colored inkjet ink, and the clear ink is a clear inkjet ink.
11. The ink set according to any one of claims 1 to 10, wherein the proportion occupied by at least one compound selected from the group consisting of a glycol ether, an organic carbonate, and an ester in the organic solvent A1 is 80% by mass to 100% by mass, and
the proportion occupied by at least one compound selected from the group consisting of a glycol ether, an organic carbonate, and an ester in the organic solvent A2 is 80% by mass to 100% by mass.
12. The ink set according to any one of claims 1 to 11, wherein the proportion occupied by a
compound having a boiling point of 150°C to 250°C in the organic solvent A1 is 80% by mass
to 100% by mass, and
the proportion occupied by a compound having a boiling point of 150°C to 250°C in the organic solvent A2 is 80% by mass to 100% by mass.
13. The ink set according to any one of claims 1 to 12, wherein the solubility of the polymer C1 in the organic solvent A1 at 25°C is 10% by mass or higher.
14. An image forming method by using the ink set according to any one of claims 1 to 13,

the method comprising:
a colored image forming step of applying the colored ink on a substrate and thereby forming a colored image; and
a clear image forming step of applying the clear ink at least on the colored image, irradiating the applied clear ink with active energy ray, and thereby forming a clear image at least on the colored image.