The time for the summer class trip to the sea is near, and the fight for Ichika's heart is as hot as the July weather. The girls will stop at nothing to corner him for their own, and when the swimsuits come out, it may just be checkmate! With the arrival of Shinonono "The Genius" Tabane comes a huge surprise, and just the thing Houki needs to even the playing field. But it's not all fun in the sun when a military IS goes on a rampage, causing Ichika and the cadets to spring into action. Will our dear cast come to learn the meaning of true inner strength? Find out in this installment of IS, the high-speed school action romantic comedy!