“我是想要让我成为同伴之人的同伴。仅此而已！” 失去了过去的记忆，平稳地生活着的高中生·黑井宗矢。 某天，他的城市突然遭到神秘的巨大兵器“星云兵器”的袭击。 宗矢与长得像猫的“老师”和哥特萝莉银子一起被卷入战斗当中， 但——没想到对手竟然是保护城市的7位英雄！ 隐藏在宗矢记忆中的战斗理由究竟是？Kuroi Souya is a high school-er living a peaceful life despite having no memories of his past. One day, however, his town is attacked by one of the mysterious Nebula Weapons. Together with the cat-like "Sensei" and the gothic Lolita Ginko, Souya gets dragged into a battle against - seven superheroes who protect the town. What is Souya's reason to fight? The answer lies in his memories.
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