Just like I state in previous reply, keyless is an option for new owner to choose. Even you bought a standard variant of passo or boon at japan, you still can installed the keyless-go system if you wish. If not, your car will be provide standard key without immobilizer. But sometimes, Toyota japan offer certain type of new variant which got all complete package like 1.3 + Hana with certain new color (manufacturer option). This manufacture option will got all accessories which standard not offers just like keyless-go function.
Its different with other country car maker which will provide certain items to certain variant. For example, standard variant will not get what premium variant has.
For example, toyata malaysia offer of 2014 vios (belta in japan) spec TRD Sportivo. Full spec but the entertainment system is standard player. If you wish to get touch screen with reverse camera, than its an option you need to pay. The major different of standard G grade and TRD is the bodypart, interior and also Sport rim and performance. Thats all.
Anyway, you can check at toyota.jp ??? ? ??????????? ? ???????? for further clarifications.