A power leaks from underneath the school,  Arata and the gang head down into the labyrinth to protect the school from the collapse phenomenon.
Basically, that's what's going on here.
Danach sieht es zumindest aus.
Eso es lo que sucedió.
Eso es lo que pasó.
Voilà ce qui s’est passé.
Ecco cosa sta succedendo, in pratica.
Basicamente, está acontecendo o seguinte.