1. A toner comprising a toner particle containing a binder resin, a colorant, a crystalline polyester, and a release agent, wherein when a cross-sectional image of the toner is observed using a scanning transmission electron microscope, domains of the crystalline polyester are present in the cross-sectional image of the toner, the domains have a number-average major diameter of at least 50 nm and not more than 300 nm, the number of the domains is at least 8 and not more than 500, and a ratio of the domains present in an area from an outline of the cross-sectional image to 25% of a distance between the outline and a centroid of the cross-sectional image, to a total number of the domains present in the cross-sectional image of the toner is at least 60 number % and not more than 100 number %.