Ayakashi Triangle

In modern Japan, where mysterious spirits called "Ayakashi" exist, a young ninja named Seigen Kazamaki battles these spirits daily to protect his childhood friend, Suzu Kanade, who loves Ayakashi. One day, a powerful cat spirit named Shirogane attacks Suzu, intending to devour her. Seigen uses a sealing technique inherited from his grandfather to barely repel Shirogane, but the spiteful Shirogane uses a spell to transform Seigen into a female body. Seigen tries to completely defeat the weakened and sealed Shirogane, but doing so would mean he could never return to being a man. Despite this, Seigen is willing to accept it to protect Suzu, but Suzu, driven by her love for Seigen and feeling guilty, strongly opposes this and insists on making peace with Shirogane. Reluctantly, Seigen declares that he will keep Shirogane as a pet under his supervision, postponing the immediate problem. Thus, a strange love triangle forms between Seigen, Suzu, and Shirogane, filled with love, opposition, and predation.