As the city prepares for Halloween, Ratman walks down an alley and a strange shadow appears before him. A voice declaring itself the true son of the emperor of the European Youkai, Backbeard, Backbeard Junior, belongs to the European youkai Bat-cat. Bat-cat asks Ratman to help him collect blood for the ressurection of Backbeard. He has a reason for wanting to achieve something great. Ratman turns him down, but when the huge reward is set in front of him, he changes his mind and offers to help. But there's no way Ratman will simply do as he's told and collect blood, is there...?!
Listen. I'm going to make you
an underworld boss.
.اسمع، سأجعلك رئيس العالم المظلم
Hör zu, ich werde dich zu
einem Boss der Unterwelt machen.
Escúchame, vas a ser un 
jefe de los bajos fondos.
Escúchame, vas a ser
un jefe del bajo mundo.
Siamo intesi? Ti farò diventare
 un "boss della società occulta", Kōmori Neko!
Ouça, eu vou fazer você
meu chefe do submundo.