"A spirit from Chinese legend, shaped like a sheep, that can see through any lie. It occasionally appears in the human world to punish evildoers with the power stored in its sharp horn."
—Compendium Info
Kaichi is the Japanese name for a mythological goat-like creature of Ancient China, the Xiezhai, that strikes evil fiends using its powerful horn.
"A mythical creature of Chinese lore that looks like a sheep with a single horn on its head. It can see through lies and is said to appear on Earth periodically to punish the guilty. Xiezhai is currently the official symbol of gavels in Chinese courts."
—Shin Megami Tensei: Devil Survivor 2 Compendium
In Shin Megami Tensei: Devil Survivor 2, Xiezhai is a Unique demon that doesn't require a particular fusion combination to create. Instead, the player has to achieve a Fate level of 3 with Airi Ban before it is available. Once this has been achieved, it is unlocked for fusion on all subsequent runs as long as the player imports his/her save.