主人公·大叔是一位外表帅气却过着放荡生活的父亲，工作是马桶盖设计师。和妻子离婚后与学习运动万能的女儿小敏一起生活。某天在一次平常的厕所蹲坑中大叔竟然让马桶吸了进去！ 穿越到未知世界的大叔被赋予拯救地球的重任，稀里糊涂的成为了超级英雄！而成为英雄的代价却是将原本英俊帅气的大叔变成了臃肿丑陋的大胖子！！守护地球和小敏的战斗，就此开始…The protagonist, Old Man, is very attractive but a terrible slob, a failure as a father, and works as a toilet seat designer. He is divorced from his wife, and lives with his daughter, Min-chan, who is both very smart and athletic. One day, as he was taking a dump, he was sucked into his toilet and given the important job of becoming a hero to save the world. He ends up having to give up his good looks for a chubby frame in exchange. Old Man's battle to protect the Earth and Min-chan is about to start.
