In the spring of that year--- Keiichi's younger brother enrolls in the same school as him -- as a trap! Madly in love with his older brother, while searching the internet finds an internet trap idol and decides to copy him. "I'm going to be my older brother's girlfriend!" But would you believe it -- the person that is with his brother is the very trap idol he was copying! He was his older brother's classmate! What are to traps to do but to fight over the boy they love. So the classmate proposes a battle to prove that they are the one most suitable for Keiichi.

Sparks fly between the two rivals as Keiichi sighs only to find his younger brother going for his crotch! And like this, a strange new term starts.