Man...the sister's creepier than the monster itself

This manga always goes from super cute to freakishly terrifying

I forgot Niguredou was the same size as Mieruko's younger brother, so it makes sense that his clothes would fit her. BUT IT'S JUST SO HILARIOUS TO SEE HAHAHAHAH

Super sis-con

Perhaps the sister isn't a sis-con. Maybe she knows how her sister is. What if her sister has become obsessed before and that person disappeared, so she is trying to prevent that by keeping an eye on her? (Pure speculation.)

Wtf

someone get that sister outta here