It's Yume and Mizuto's first summer together as stepsiblings. Their parents are unable to return home one night due to a typhoon. Now alone in the house together, trouble arises when Yume spots a certain creepy crawly in her room. On another day, Mizuto accompanies Yume clothes shopping for a swimsuit in preparation for an upcoming family trip to the countryside. It's in situations like these that the two seem to be finding themselves reminiscing about the past more and more...
Those things have walked the earth
for three hundred million years.
نجت تلك الأشياء على هذه الأرض 
.لأزيد من ثلاثمائة مليون سنة
Die leben seit dreihundert
Millionen Jahren auf der Erde.
Esos bichos resisten lo que sea.
Esos bichos resisten lo que sea.
Ils existent
depuis 300 millions d’années.
Quei cosi camminano su questa terra
da trecento milioni di anni.
Elas estão na Terra há
300 milhões de anos.
Они на Земле уже триста 
миллионов лет живут.