故事发生在一个名为“弗洛尼尔德”的架空世界之中,迦雷特狮子团的公主蕾昂米修莉(小清水亚美 配音)带领着她的精锐部队大举入侵邻国比斯科迪共和国,身为共和国的公主,米希奥蕾(堀江由衣 配音)深深的为祖国的未来担忧着,无奈之下,她决心向异世界发出求救的信号,希望那里有人能够成为国家的救星。 泉真红(宫野真守 配音)只是一介平凡的日本少年,然而,正是他受到了米希奥蕾的召唤,来到了弗洛尼尔德,在这里,他结识了个性认真的艾克蕾尔(竹达彩奈 配音)、聪慧过人的利歌塔(水树奈奈 配音)和成熟稳重的尤基卡泽(阿澄佳奈 配音)等人,在和蕾昂米修莉的战斗中,泉真红和伙伴们的羁绊也在加深着。Following Cinque's wild adventure in the Flonyard - an alternate world where its inhabitants look like humans but with animal ears - he is summoned back once again. However, this time he is joined with childhood friend Rebecca and cousin Nanami to become Galette's Hero as the war wages on the battlefield and in desperate need for an end to the fighting..."