Deta! Arale wo Yuukaishita Aho na Yatsu

The first part takes place during the time of the Neanderthals. Mashirito kidnaps Midori because he has a crush on her and wants to marry her. Senbei wants to rescue his beloved and relies on Arale's powers, but since glasses did not exist in the Stone Age, Arale is only partially effective and constantly misses her target.