Ichinokura Ryuu and twenty-so others stand on an inevitable point in life. Rather, it’d be more appropriate to say they are currently standing on that point quite literally as they gaze at the incoming nuclear missile head about to dissipate them wholly. To think they’ve narrowly escaped from many bad situations today, one of which being the prevention of rape of Kurisu Kanu from the very army who vowed to protect their country, only to face impending doom so soon. It all started in Minkei Gakuen, on a regular day. Ryuu was asked by his teacher Oogawa to join the student expedition team for Mirokujima, a recently discovered unknown island that never appeared on maps before. The trip which normally would be viewed as “lame” is fueled by the one fact that the “cool, mysterious and beautiful” school, no district idol Kurisu Kanu is participating. At any means it was supposed to be a healthy and safe trip as Ryuu convinces his childhood friend Tsukimura Emu to stay put at home. The next day Ryuu left for Mirokujima: A supposingly uneventful journey.