Kousaka Yuusei had just transferred to a traditional all-boys school.

However due to the declining student population, the school enacted a policy that would allow non-male students to attend the historically all-boys school. However, as a side effect, quickly after that, there were practically no ordinary male students left.

Soon afterwards Yuusei gets introduced to two charming "girls", Asuka the sultry ganguro and Miyabi the refined (but secretly lascivious) young lady, he suddenly becomes overwhelmed by their alluring faces and bodies. Until they reveal to him that they are actually traps, Yuusei become shocked at the revelation, how could these two traps be more attractive than most girls?

Asuka and Miyabi become interested in Yuusei since he is an ordinary male which has become a rarity in this school where the vast majority of the student population is made up of trangirls, this is the start of Yuusei's story in this school filled with traps where he will develop a relationship with Asuka and/or Miyabi.