SPS

SPS, also known as Sei Poster Syndrome, is a condition contracted from contact and association with Sei Takanashi. Marshal Takamori and another individual have done significant research into the subject, by subjecting Sei to strange and inhumane experiments. Still, there is not much known about SPS aside from what's on the surface.

Contracting SPS makes you one of the Seiposters, according to Shion.

Symptoms
-Suddenly liking and/or talking about swords, gothic lolita, maids, or nekomimi.

-Enabling Sei

-Reading this wiki