The present invention can sufficiently suppress curling phenomenon of a recorded product and facilitate handling of a printed product produced by using plain paper, in particular. The computer program may be a sequential program or may be a concurrent program. Further including a transfer device that includes a first section for piercing a septum of the vial and a second section for releasably mating with the fluid delivery device. Each sealed air chamber is connected with the main channel by at least one one-way valve each including at least two layers of plastic films. Specifically, a composition containing acyl proline represented by the formula or a salt thereof, and one or more kinds selected from anisic acid and phenylalkanol is provided. The enrichment control unit sets the degree of richness of the injected fuel to a first degree of richness that is greater than stoichiometry from the start of the enrichment process, and maintains the first degree of richness even after the output of the detection unit has reached a stoichiometric air-fuel ratio or richlean value.