It's been five days since Saitama became a professional hero and he has yet to do anything heroic. When Genos informs him that C-class heroes who don't fight bad guys are dropped from the hero registry after a week of inaction...
MYSTERY MONSTER DEFEATS
CLASS A HEROES

your rank has gone up
from last place, 388th, to 342nd.
sind Sie vom letzten Platz 388
auf den Platz 342 aufgestiegen.
2 HÉROS DE CLASSE A
ATTAQUÉS PAR UN MYSTÉRIEUX MONSTRE
DUE EROI DI CLASSE A BATTUTI
DA UN ENIGMATICO ESSERE MISTERIOSO