A drying device includes a conveying unit, a hot air blowing unit, a passage forming unit, and an adjusting unit. The conveying unit conveys a medium to which a liquid is discharged from a discharging head. The hot air blowing unit includes a blowing unit that blows air, and a heating unit that heats air. The passage forming unit forms, between the hot air blowing unit and a region on a conveying unit conveyance path, a circulation path through which air blown from the hot air blowing unit is circulated. The adjusting unit adjusts a ratio between inside air circulating through the circulation path and outside air that is introduced into the circulation path. If a temperature increase condition is established, the adjusting unit increases a ratio of the inside air. If a temperature decrease condition is established, the adjusting unit increases a ratio of the outside air.

An ink set includes: a first ink, a second ink, and a third ink. Each of the first ink, the second ink, and the third ink includes a binder, an organic solvent, water, and a surfactant, and the binder included in the first ink includes at least one of an acrylic resin or a polyolefin resin. The binder included in each of the second ink and the third ink includes a urethane resin, An absolute value of a difference between surface tension of the first ink and surface tension of the second ink is 2.0 mN/m or less. An absolute value of a difference between the surface tension of the first ink and surface tension of the third ink is 2.0 mN/m or less.