Bicorn is a demonic unicorn with two horns. The number 1 supposedly represents the purity of man, and 2 represents the seductions brought with the arrival of women. Bicorn supposedly represents adultery. It is said that the Unicorn was born from a Bicorn and once had two horns itself.
"A monster with two sharp, spiraling horns on its forehead, considered the counterpart of the unicorn. Males are called bicorns, while females are called chichevaches ("thin cows"). If unicorns are considered holy, then bicorns are considered unholy, reviled as filthy beasts. The number 1 is said to signify the purity of man, while the number 2 represents the seduction brought by the arrival of women. This dualistic nature has proved especially influential in Japan. Unicorns are said to have originated from bicorns, and once had two horns themselves. They are also thought to have been invented later as symbols of good to oppose the "evil" bicorns. Bicorns are said to symbolize adultery, one of the Seven Deadly Sins."
—Shin Megami Tensei IMAGINE Compendium
Bicorn can be contracted on Nakano field and within Nakano Stone Site. It is one of the mountable demons within the game and one of the few that has two different nimble variations.