Shingon, “true word”, was brought from China to Japan by Kūkai in the ninth century. It teaches that the cosmic Buddha Mahāvairocana is present in all things, and that through the three mysteries of body, speech and mind, gesture, mantra and visualization, the practitioner can realize buddhahood in this very body. Its centre is Mount Kōya.
Shingon
The Japanese school of esoteric Buddhism founded by Kūkai, teaching buddhahood in this very body.
Also: Mikkyo