Set and ink jet recording method

A set comprising:

• a treatment solution composition that contains particles containing organopolysiloxane, and water;
• and
• an ink jet ink composition that contains a pigment and water, wherein
• in a ratio of a static surface tension of the ink jet ink composition to a static surface tension of the treatment solution composition, the static surface tension of the treatment solution composition is from 1.0 to 1.5 when the static surface tension of the ink jet ink composition is set to 1,
• the static surface tension of the treatment solution composition is from 25 to 40 mN/m,
• a content of the particles containing organopolysiloxane is from 8% to 25% by mass with respect to a total amount of the treatment solution composition, and
• the treatment solution composition and the ink jet ink composition are discharged by an ink jet method and used.