Well, wasn't expecting a retcon/contradiction to page 2/3 of chapter 1 that showed EIGHT karin's. If it's safe to assume the entire class is just karin and MC then that's like 25+ Karin's
based on this being the SECOND time a small spider has shown up in relation to her AND she mentioned memories I think it's safe to say she is a Jorōgumo.
no offense to the mangaka or whoever did the art for page 11 but WTF is up with her height?! Either she is wearing insanely high heels or they can't do perspective right