Sei industry to flood the modern society. The trap which girls who lost resistance to Koto selling Sei by the mean spin control of adults who are parasitic on the "Schoolgirl" Brand which became big business fall into! Coax the Schoolgirl Riku which came to sell underwear to "burusera" shop to buy the birthday present to a boyfriend, and exchange survival in a shop; forcibly. Of course be not done with only it!
