Aqueous ink composition, ink set, and image-forming method

An aqueous ink composition comprising:

• at least an aqueous medium and resin fine particles,
• wherein a proportion of a water-soluble organic solvent occupied in the aqueous medium, which has a boiling point of 250° C. or higher, is 3% by mass or less, and
• a resin constituting the resin fine particle contains at least one kind of constitutional units represented by General Formula (1) or (2),
• in the formulae, R1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms,
• A1 represents —O—, —NH—, or —N(L2-Y2)—,
• L1 represents an alkylene group, an alkenylene group, an alkynylene group, a group selected from —O—, —NH—, —N(L2-Y2)—, and —C(═O)—, or a divalent group formed by combining two or more kinds of these groups,
• Y1 represents —OH, —OR2, —NH2, —NR2H, —NR2R3, —SH, —S(═O)2OM, or —OP(═O)(OM)2, where, R2 and R3 each represent an alkyl group, an alkenyl group, or an alkynyl group, M represents a hydrogen atom, an alkali metal ion, or an ammonium ion,
• L2 represents an alkylene group, an alkenylene group, an alkynylene group, a group selected from —O—, —NH—, and —C(═O)—, or a divalent group formed by combining two or more kinds of these groups, and
• Y2 has the same definition as V.