There are still monsters about, and the gang is spending their days fighting them.  They go to school during the day, and when they're not at school, they protect the city from monsters.  But their peaceful routine is interrupted by the arrival of Mana Livingstone: a transfer student from America who's got the craziest ideas about Japan!
There's a secret place downstairs that 
only middle school kids can enter.
Im Untergeschoss gibt es einen Geheimort,
den nur Mittelschüler betreten dürfen.
Debajo hay un sitio secreto
para estudiantes de secundaria.
Debajo hay un sitio secreto
para estudiantes de secundaria.
Un niveau secret au sous-sol
est réservé aux collégiens.
Sotto di esso, c'è un luogo a cui
possono accedere solamente gli studenti delle medie.
No subsolo, há um lugar secreto onde
 apenas estudantes do fundamental podem entrar.