I'm gonna be so mad if every character MC meets is gonna be involved in some way with his sister, if not actually being his sister.
Tall about really showing how yandere can work.
Hmm well the elf made a creepy face but doesn't necessarily mean she's the little sister at least I hope not but damn this dude is definitely in a nightmare gotta feel for him and who is the person with their tongue out on the last page is that her?
Im not sure but the elf is not the sister, or I suppose to say. The Yandere sister will come later in the academy arc. So rest assured, dont know for sure if this will follow the wn path.
There's gotta be mind control or something going on. She has the ability to copy anyone's ability.. that seems to be a clue. She's an elf, so if MC is an elf, and is able to control other elves as an extension of herself at will..