A girl who hosts a goddess will remember everything that happened during her conquest.  In other words, she will remember falling in love with Keima.  Armed with that information, Keima attempts to walk home from school with all five potential hosts and increase their affection level.
The Ancestor Galactic War has been 
raging for six hundred years."
La Guerra Galáctica de los Ancestros 
había continuado por 600 años.
La Guerra Galáctica de los Ancestros 
se había alargado 600 años.
A Guerra Galática dos nossos ancestrais
 está acontecendo faz seis anos."