PROBLEM TO BE SOLVED: To provide a yarn which is improved in the degree of freedom of generating emission spectra, and a net including the yarns.SOLUTION: A yarn 10 comprises a plurality of fibers 11. The plurality of fibers 11 include a first fiber 111 having a first luminous agent and a second fiber 115 having a second luminous agent different from the first luminous agent. As needed, the first luminous agent and the second luminous agent can be employed so that an emission spectrum of the first fiber 111 and an emission spectrum of the second fiber 115 overlap each other at least in some wavelengths.