时代背景设定在世界变动率为“1.048596%”的2019年。在这样一个机器人已经普遍实用化的未来，种子岛中央高校的“机器人研究部”正面临废部危机，而仅有的两名部员之一——八汐海翔就算面临着这样的情况，仍旧对“机器人研究部”感到兴趣盎然，并且依旧热衷于机器人格斗游戏。而另一位一根筋的废材部长瀬乃宮秋穂为了避免被废部，正在以“完成巨型机器人”为目标奋斗着。然而某天，海翔发现了一份名为“君岛报告”的A.R.笔记。在这份笔记里面，记录着名为君岛安科的人将会把整个世界都卷进来的大阴谋。

Two different students - a successful but aloof academic and a rebellious but kindhearted delinquent - form a friendship through their love for music.

In Orario, fearless adventurers band together in search of fame and fortune within the underground labyrinth known as the Dungeon. But Bell Cranel, novice adventurer, has bigger plans than riches and glory; he fights monsters in the hope of having a fateful encounter with a girl. When this happens, it doesn't go exactly as he planned. Thus begins the story of an unlikely pair, a boy and a goddess, both trying to prove themselves, both eager to reach their goals.

100 years ago, the last remnants of humanity were forced to retreat behind the towering walls of a fortified city to escape the massive, man-eating Titans that roamed the land outside their fortress. Only the members of the Scouting Legion dared to stray beyond the safety of the walls – but even those brave warriors seldom returned alive. Those within the city clung to the illusion of a peaceful existence until the day that dream was shattered, and their slim chance at survival was reduced to one horrifying choice: kill – or be devoured!