Mao sets a trap to lure out the shikigami user by making the attacking shikigami drink a talisman. Suddenly, a giant made of fish and water appears. The giant demands that Mao teach him the ultimate secret technique of Onmyodo, "Taizan Fukun," which allows him to manipulate people's lifespans.

Attacked by a water shikigami, Mao is reminded of the greatest water sorcerer of the Mikage family from the Heian period, but is confused as to why that sorcerer would send an assassin. Meanwhile, Kamon infiltrates the floating temple where the Mikage family's onmyoji is said to reside and is reunited with Shiranui.