A middle-aged, single salaryman, Kato Taro, wakes up in a desert world called the 'Great Desert.' Summoned as a 'changer' to improve the world, his unimpressive appearance leads to his dismissal by the king. Banished to another city, the sand ship carrying him is attacked and destroyed by monstrous sand beasts—all part of the king's plot to summon a new changer. However, discovering an oasis changes everything! With the help of beautiful girls and his rare skill, 'Online Shopping,' this old man enjoys his desert life to the fullest!