after page 3 , the mangaka doesnt show the corpses of the 3 grand-mothers , so there is a chance that they are still alive .
the russian invading aliens just locked the 3 grand-mothers in prison , and tortured them , and used them as love-slaves , lol .
page 10 :
if alien girl becomes my wife , she will be a cheap wife , lol , she doesnt eat expensive foods , she can just eat free grass .
and alien girl is a voyeur / a peeping tom , lol . she loves turning invisible and watching peoples kissing and making love .
last pages :
- alien girl : okaa-san , please give me courage .