When the teachings of Shingon Buddhism were brought to Japan, Esoteric Buddhism was still in its early stages in India.
Anuttarayoga Tantras such as the Yamantaka Tantra, Hevajra Tantra, Mahamaya Tantra, Cakrasaṃvara Tantra, and the Kalachakra Tantra were developed at a later period of Esoteric Buddhism and are not used in Shingon.