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.
They all just have to do things their own way...
¿Por qué tienen que ser tan difíciles?
¿Por qué tienen que ser tan difíciles?
Por que elas têm que ser tão difíceis?